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quy1988
2 năm trước
Tìm x a) x(2x-1)-(x+2)(2x+3)=0 b) (2x+7)^2 - 4x(x-3)= -31 Tính(x+y)^2 biết x-y=10 ; x.y=4 Giúp em với ạ , em cảm ơn
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