(2x/2x+y - 4x^2/4x^2+4xy+y^2)/(2x/4x^2 + 1/y-x)其中x,y满足方程组2x-
先化简,再求值(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2*1/x+y,其中x=-4,y=1
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
解方程组 1.(x-1)(x-2)等于xy 2.x(x+2)-4y(y-1)等于(x+2y)(x-2y)
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
1、x(x-y)(x+y)-x(x+y)^2
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
解方程组:(x-1)(y-2)=xy和x(x+2)-4y(y-1)=(x+2y)(x-2y)
解方程组{(x-1)(y-2)=xy {x(x+2)-4y(y-1)=(x-2y)(x+2y)