bai toán chua hang khonhung giai khong duoc

M

mr_cross_fire

[TEX]\frac{5}{9}.\frac{7}{13}+\frac{5}{9}.\frac{9}{13}-\frac{5}{9}.\frac{3}{13}[/TEX]
[TEX]=\frac{5}{9}.(\frac{7}{13}+\frac{9}{13}-\frac{3}{13})[/TEX]
[TEX]=\frac{5}{9}.1[/TEX]
[TEX]=\frac{5}{9}[/TEX]
 
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