Question

Tìm x,y nguyên sao cho (x+y)² = (x-1)(y+1)

Answer 1

nhân tung ra sẽ được: x^2+xy+y^2-x+y=-1. suy ra 2(x^2+xy+y^2-x+y)=-2 suy ra (x+y)^2+(x-1)^2+(y+1)^2=0 suy ra x=1, y=-1

Answer 2

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Answer 3

kho qua