Toán Lớp 7: a/b +c/d = a^2 + b^2 / a^2 - c^2 + c^2 + d^2 / b^2 - d^2

a/b +c/d = a^2 + b^2 / a^2 - c^2 + c^2 + d^2 / b^2 - d^2 = 1/5

Toán Lớp 7: a/b +c/d = a^2 + b^2 / a^2 - c^2 + c^2 + d^2 / b^2

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