Toán Lớp 7: cho tỉ lệ thức `a/b=c/d` CMR `{3c^2+5a^2}/{3d^2+5b^2}=c^2/d^2` -

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Toán Lớp 7: cho tỉ lệ thức `a/b=c/d` CMR `{3c^2+5a^2}/{3d^2+5b^2}=c^2/d^2`