Câu 1
A=\frac{1.5.6(2+4+9)}{1.3.5(2+4+9)}
A=\frac{1.5.6}{1.3.5}
A=\frac{6}{3}
A=2
Câu 2
a) C thuộc AB, BC=4
=>AC+BC=AC+4=8=>AC=4cm
b) Bó tay :(((
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