2012x+2010y=4022,2010x+2012y=-4022
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
化简(2x^3y^3+x^4y^2+x^2y^4)^2-x^2y^2(x+y)^2,x=2012,y=-2011
先化简,再求值 (1)[(x-y)的平方+(x+y)(x-y)]÷2x 其中X=2010,y=2009 (2)y(x+y
当x-y/x+y=2009/2010时,求代数式2009(x+y)/x-y+4020(x-y)/x+y的值.
已知x=-2011/2012,y=-2010/2011,比较x,y的大小
xy=2010,x+y=2009,求x,y
已知x、y满足方程组3x+y=2013,x+3y=2012,求x-y
若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
已知(2011+y-x)(x-y-2009)=-2010,求(2011+y-x)²+(2009+y-x)&su
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x))
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
已知2x-y=4022 求式子[(x的平方+y的平方)-(x-y)的平方+2y(x-y)]除4y的值