bai toan lop 7 hay fday giai giup nha

A

anhnd1102

[TEX]\frac{a}{b} = \frac{c}{d} => \frac{a}{c} = \frac{b}{d} => \frac{4a}{4c} = \frac{7b}{7d}[/TEX]
Theo t/c tỉ lệ thức ta có:

[TEX]\= \frac{4a - 7b}{4c - 7d} = \frac{4a + 7b}{4c + 7d}[/TEX]
 
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