化简:-1/3x+(-2/3x+1/3y²)-(-2/3Y²+2x)=
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化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x)
1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
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若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
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化简 x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}过程一步一步的列好x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y
(Y-X)^3*(X-Y)^m+(X-Y) ^m+1*(Y-X)^2
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方