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Toán Lớp 7: cho a/b=c/d. CMR: ad/cd=a^2-b^2/c^2-d^2 và (a+c/c+d)^2=a^2+b^2/c^2+d^2

Home/ Toán Lớp 7: cho a/b=c/d. CMR: ad/cd=a^2-b^2/c^2-d^2 và (a+c/c+d)^2=a^2+b^2/c^2+d^2

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