giup minh vs

K

k1nk1n_96

[TEX] \frac{AB^3}{BC^2}[/TEX] = [TEX]\frac{AB^2}{BC^2}[/TEX] x AB = [TEX]\frac{BM^2}{BH^2}[/TEX] x AB
= [TEX]\frac{BM^2}{AB.BM}[/TEX] x AB = [TEX]\frac{BM}{AB}[/TEX] x AB = BM
 
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