Toán Lớp 7: Chứng minh rằng a/b=c/d thì a^2+b^2 / b^2+c^2 =a/c -

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Toán Lớp 7: Chứng minh rằng a/b=c/d thì a^2+b^2 / b^2+c^2 =a/c