Summer 2014 4-5
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"2014
' ' 4-5"
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x 4 4y 100a2 25. .
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8x2+ 6x25m2 4
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f(x):
f(x) = 2(x 1)2 8f(x) = 2(x + 1)(x 3)f(x) = 2x2 4x 6
. .. , :
- - - . . f(x), .
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:1(y = x
22(y = (x 3)2
3(y = (x + 3)2
. .. ?. ?. )2( )1(?. ))3 )2(?
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15. ,12 , . .
) 1025"(, , , f(x) = 4x + 19
x ) (,-f(x) . ) 45"(, ,
, 3
19x
3
26g(x) ++++====
: 4 3535=f(4) = 4.4 +19. .
161210521 47
. .161210521
56
. -f(x)-g(x). .
. ? ?
. f(10),g(10). ?. x :g(x) > f(x)
? . x :
(i) f(x) = 51 (ii) 3
169)x(g = ?. .)i(f(2) g(2))ii(f(10) g(10)
x
y
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A
BC
D
E
1.5'
2'28'
-20% . 1,280".
). ). 30% .
AF?
. 20,' .
, " : . 1.5,' .
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A
B C D
F E
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LGKC. M .CK
RC LM,EK GM.
:LCM. GKM. :CRM. KEM.. EGK. .:(.:REIICK. REM?(
PEN ).) .H = 90 ET .
S NE. SHEN .
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)1 .)2
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o90=AOB).(
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).)o90=B .
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).( . CBA.
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. : , .
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