Toán Lớp 7: cho tỉ lệ thức a/b=c/d CMR ab/cd =a^2-b^2/c^2-d^2
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Toán Lớp 7: cho tỉ lệ thức a/b=c/d CMR ab/cd =a^2-b^2/c^2-d^2
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