cho a/b = c/d . Chứng minh 5a + 3b / 5c + 3d = 5a - 3b / 5c - 3d =3d
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\[\begin{array}{l} \frac{a}{b} = \frac{c}{d} \Rightarrow \frac{a}{c} = \frac{b}{d}\\ \Rightarrow \frac{{5a}}{{5c}} = \frac{{3b}}{{3d}}\\ Ap\,\,dung\,\,tinh\,\,chat\,\,cua\,\,day\,\,ti\,\,so\,\,bang\,\,nhau\,\,ta\,\,co:\\ \frac{a}{c} = \frac{b}{d} = \frac{{5a}}{{5c}} = \frac{{3b}}{{3d}} = \frac{{5a + 3b}}{{5c + 3d}} = \frac{{5a - 3b}}{{5c - 3d}}. \end{array}\]
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