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Hình vẽ:
M A B 8 cm 4 cm
a/ Ta có: AM = 4 cm; AB = 8 cm
Vì AM < AB (4 <8) nên M nằm giữa A và B
b/ Ta có: AB = AM + MB
hay 8 = 4 + MB
=> MB = 4 cm
Ta có: AM = MB ( 4cm = 4cm)
c/ Ta có: AM = MB = 4cm = \(\frac{1}{2}\)AB
nên M là trung điểm AB
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Chọn A
A nha