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pandahieu

Câu a)
cau a

$\angle ACN= \angle ABM$

$\frac{BM}{MH}= \frac{CN}{ND}$ \Rightarrow $\frac{CN}{CD}= \frac{BM}{BH}$

\Rightarrow $\frac{CN}{BM}= \frac{CD}{BH}$

tam giac $ABH$ dong dang tam giac $DBA$

=>$\frac{AB}{DB}= \frac{BH}{AB}= \frac{BH}{DC}= \frac{AB}{AC}$

=>$\frac{CN}{BM}= \frac{CD}{BH}= \frac{AC}{AB}$

tam giacNCA dong dang tam giacMBA(cgc)
 
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