x(x+2y)-(x+1)^2+2x 其中x=1/25 y=-25
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x(x+2y)-(x+1)^2+2x 其中x=1/25 y=-25
x(x+2y)-(x+1)^2+2x 其中x=1/25 y=-25
x(x+2y)-(x+1)^2+2x 其中x=1/25 y=-25
x(x+2y)-(x+1)^2+2x
=x²+2xy-x²-2x-1+2x
=2xy-1
=-2-1
=-3
把原式全部展开
=x^2+2xy-x^2-2x-1+2x
=2xy-1
当x=1/25,y=-25时
原式=3
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