2x(x+2y)+2(x+1)^2-(2x)^2-4x 其中x=25分之1 y=25

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2x(x+2y)+2(x+1)^2-(2x)^2-4x 其中x=25分之1 y=25
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2x(x+2y)+2(x+1)^2-(2x)^2-4x 其中x=25分之1 y=25
2x(x+2y)+2(x+1)^2-(2x)^2-4x 其中x=25分之1 y=25

2x(x+2y)+2(x+1)^2-(2x)^2-4x 其中x=25分之1 y=25
2x(x+2y)+2(x+1)^2-(2x)^2-4x
=2x²+4xy+2x²+4x+2-4x²-4x
=4xy+2
把x=1/25 y=25代人上式得：
4×5×1/25+2
=6

....等于6
最后就剩下4XY+2，带进去正好XY没了..

化简后将x、y代入，即求出结果。这样的题目也求助，实在是手太懒。

因式分解x(x+y)(x-y)-x(x+y)^2 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 x^2(x-y)+(y-x) x(x-y)2-(y-x)3 (x/x+y-x/y-x-2xy/x.x-y.y)/(1/x-1/y) 分式化简 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 【(x-y)^2+(x+y)(x-y)】除以 2x [(x-y)²+(x+y)(x-y)]除以2x [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)