Tiết 47

8/2/2019 Tit 47

1/19

pd f Machine

A pdf wr i te r tha t pr oduces qua l i ty PDF f i les wi th ease!

Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click print, select the

Broadgun pdfMachine printer and thats it! Get yours now!
http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

2/19

CuCu 11:: in t thch hp vo ch trng:a. Mun cng hai s nguyn khc du ta . . . . . . hai gi trtuyt i ca chng (s ln tr s nh), ri . . . . . . . kt qutm - c du ca s c gi tr tuyt i . . . . . . .

tm hiu

t tr- c

ln hn

(1)

(2)

(3)

b. Mun cng hai s nguyn cng du ta . . . . . . hai gi trcng

(4)

uy c a c ng r . . . . . . . r- c qu m - c.u c ungc. Hai s nguyn i nhau c tng bng0(6)

a. (-2)+(-3) v (-3)+(-2) b. (-5)+(+7) v (+7)+(-5)c (-8)+(+4) v (+4)+(-8)

Cu 2: Pht biu cc tnh cht ca php cng s

t nhin? Tnh v so snh kt qu

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

3/19

8/2/2019 Tit 47

4/19

Tit 47

a. (-2) + (-3) = - ( 2 + 3 ) = -5- ( 3 + 2 ) = -5= (-3) + (-2)ay (-2) + (-3)

(-3) + (-2) =-

1) Tnh chat giao hoan= ?1 Tnh v so snh kt qu

= (-3) + (-2)ay (-2) + (-3)b. (-5) + (+7) =(+7) + (-5) =

Va y (-5) + (+7) = (+7) + (-5)+ ( 7 - 5 ) = +2+ ( 7 - 5 ) = +2

c. (-8) + (+ 4) =(+4) + (-8) = - ( 8 - 4 ) = -4

Va y (-8) + (+4) = (+4) + (-8)- ( 8 - 4 ) = -4

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

5/19

Tit 471. Tnh cha t giao hoan

a + b = b + a [ (-3) + 4 ] + 2 =(-3) + ( 4 + 2 ) =[ (-3) + 2 ] + 4 =

1 + 2 = 3(-3) + 6 = 3(-1) + 4 = 3

2. Tnh cha t kt hpa + b + c = a+ b + c))?2i tpTnh v so snh kt qu

[ (-3) + 2 ] + 4 = (-1) + 4 = 3[ (-3) + 4 ] + 2 = (-3) + ( 4 + 2 )

= [ (-3) + 2 ] + 4

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

6/19

Tit 471. Tnh cha t giao hoan

a + b = b + a2. Tnh cha t kt hpa + b + c = a+ b + c) ( )Ket qua tren go i la tong cu aba so a,b,c va vie t a+b+c.Tng t, ta c th ni ntng ca bn, nm , s nguyn

Ch tng ca bn, nm , s nguynK hi thc hie n cong nhieu so ta co the thay o i tuy y th tca c so hang, nho m cac sohang m ot cach tuy y bang cacdau ( ) ; [ ] ; { }

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

7/19

Tit 471. Tnh cha t giao hoana + b = b + a2. Tnh cha t kt hpa + b + c = a+ (b + c))

Tnh:(- 10) + 0

(+ 12) + 0 =

= (-10)

(+12)

Mi s nguyncng vi s 0 ckt qu nh- th

no?

3. Cong vi 0

a + 0 = 0 + a = a

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

8/19

Tit 471. Tnh cha t giao hoana + b = b + a2. Tnh cha t kt hpa + b + c = a+ b + c) ( )3. Cong v i 0

Bi tp : Thc hin phptnh sau(-12) + 1225 + (-25) =

=00

Ta ni: (-12) v 12 l hai s. Cong vi 0a + 0 = 0 + a = a Ta ni: (-12) v 12 l hai si nhau.25 v (-25) cng l hai s inhau.. Co ng v i so o iS i ca a k hiu l -aS i ca a k hiu l -(-a) a + (-a) =?+ ( -a) = 0 -(-a) = a

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

9/19


Nu c a + b =0 th a v b lhai s nh- th

Ng- c l i: a + b = 0 th a v bl hai s i nhau. Khi ta ca = -b hoc b = -a

Vy hai s iai s c tng bng 0 th chng3. Cong v i 0a + 0 = 0 + a = a4. Cong vi so o iS i ca a k hiu l -aS i ca a k hiu l -(-a)

hai s nh- thno vi nhau?

a + ( -a) = 0

Vy hai s inhau l hai s ctng nh- th no?Hai s c tng bng 0 th chngl hai s i nhau.

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

10/19


Tm tong cu a tat ca songuyen a biet -3 < a < 3?3

Gii :Cac so nguyen a thoa man

Trong bi tontrn ta s dng. Cong vi 0a + 0 = 0 + a = a

4. Cong vi so o iS i ca a k hiu l -aS i ca a k hiu l -(-a)a + ( -a) = 0

Cac so nguyen a thoa man-3 < a < 3 la :-2 ; -1 ; 0 ; 1 ; 2Nn ta c tong :(-2) + (-1) + 0 + 1 + 2= [(-2) + 2] +[(-1) + 1] +0= 0

trn ta s dngnhng tnh chtno?nh cht giao hon , tnh chtkt hp

Cng vi s 0pd f MachineA pdf wr i te r tha t pr oduces qua l i ty PDF f i les wi th ease!Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, simply open the document you want to convert, click print, select the

http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

11/19


Bi tp: S i ca s nguyna l s m hay s d- ngnua, a l s nguyn m ?

S i ca a l s nguyn d- ng.3. Cong v i 0a + 0 = 0 + a = a4. Cong vi so o iS i ca a k hiu l -aS i ca a k hiu l -(-a)a + ( -a) = 0

S i ca a l s nguyn m.S i ca a l s nguyn d- ng.b, a l s nguyn d- ng?

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

12/19

i A

1 2 3 4 i B

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

13/19

Ht giCu 1: Nhng tnh cht no - c s dng trongli gii d- i y?

(-55) + 80 + (-25)

= 80 + (-55) + (-25)

= 80 + (-80)

p n:

1. tnh cht kt hp.

2. tnh cht giao hon.3. tnh cht cng vi s i.

= 0

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

14/19

Ht giCu 2:

Tm s nguyn y bit: 18 + (-20) + y = 0

p n:

18 + (-20) + y = 0

-2 + y = 0

Vy y = 2

pd f Machine




8/2/2019 Tit 47

15/19

Ht giCu 3: Thc hin php tnh:

(-17) + 5 + 8 + 17

p n:

(-17) + 5 + 8 + 17

= (-17) + 17 + (5 + 8)

= 0 + 13

= 13

pd f Machine




8/2/2019 Tit 47

16/19

Ht giCu 4: Chic diu ca bn Sn bay cao 7 m (so

vi mt t). Sau mt lc cao ca chic diu tngthm 3 m ri sau gim i 4 m. Hi chic diu cao bao nhiu mt (so vi mt t) sau hai ln thayi?

p n: Lc u cao: 7 m

Ln th nht tng thm :3 m

Ln th hai gim 4m, hay tng (-4)m

Vy cao ca diu sau hai ln tng l:

7+ 3+(-4) = 6 m

pd f Machine




8/2/2019 Tit 47

17/19

Tit 47Nu cc tnh cht ca php cng s nguyn? So

snh vi tnh cht ca php cng s t nhin.

stt

Tnh cht ca php cng

t n n nguyn

1 t/c giao hon t/c giao hon

2 t/c kt hp t/c kt hp

3 t/c cng vi 0 t/c cng vi 0

4 t/c cng vi s i

pd f Machine




8/2/2019 Tit 47

18/19

H- ng dn v nh

Hc thuc cc tnh cht php cng cc s nguyn.

Lm cc bi tp: 37b, 38, 39,40, 41, 42 trang 79

.

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

8/2/2019 Tit 47

19/19

Tit hc kt thc

Chc qu thy c vui kho

pd f Machine



http://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?clhttp://www.pdfmachine.com/?cl

Documents

Tiết 47