Toán Lớp 7: Cho tỉ lệ thức a/b = c/d (b, d $\neq$ 0). Chứng minh rằng:
$\dfrac{ab}{cd}$ = $\dfrac{(a + b)^2}{(c + d)^2}$
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Toán Lớp 7: Cho tỉ lệ thức a/b = c/d (b, d $\neq$ 0). Chứng minh rằng:
$\dfrac{ab}{cd}$ = $\dfrac{(a + b)^2}{(c + d)^2}$
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