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kehoachcaobinh
2 năm trước
Chứng minh a, $\frac{3a + 4b}{5c + 4d}$ = $\frac{3a - 4b}{5c - 4d}$ b, $\frac{11a - 10c}{11b - 12d}$ = $\frac{11a + 12c}{11b + 11d}$ c, $\frac{a-b}{a}$ = $\frac{c-d}{c}$
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