x(x+2y)-(x+1)^2+2x 其中x=1/25 y=-25,
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先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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计算:1-2x+x^2/x-x^3*xy+x^2y/x-x^2
[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
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x^2(x-y)+(y-x)
x(x-y)2-(y-x)3
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x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
函数,y=3x/(x^2+x+1) ,x