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4linhchi41
2 năm trước
Chứng minh rằng : a) $\frac{a+b}{b}$ = $\frac{c+d}{d}$ b) $\frac{a-b}{a}$ = $\frac{c-d}{d}$ c) $\frac{a}{a-b}$ = $\frac{c}{c-d}$
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