x(x+2y)-(x+1)^2+2x
=x^2+2xy-x^2-2x-1+2x
=2xy-1
=-2-1
-3
x(x+2y)-(x+1)的平方+2x，其中x=1/25，y=-25
x(x+2y)-(x+1)^2+2x
=x^2+2xy-x^2-2x-1+2x
=2xy-1
=-2-1
-3
x(x+2y)-(x+1)^2+2x
=x^2+2xy-x^2-2x-1+2x
=2xy-1
=-2-1
-3
x(x+2y)-(x+1)^2+2x
=x^2+2xy-x^2-2x-1+2x
=2xy-1
=-2-1
-3