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Scanned by CamScanner · 32: Cho tú diên OABC có OA, 0B, OC dôi mot vuông góc vúi nhau, OA = 0B = avà OC = 2a. GQi M là trung diém cúa AB. Khoång cách gita hai duðng

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Scanned by CamScanner

Scanned by CamScanner

Scanned by CamScanner

Scanned by CamScanner

Scanned by CamScanner