已知:(x+2)^2+|y+1|=0,求5xy^2-2x^2y-【3xy^2-(4xy-2x^2y)】的值
已知(x+2)*+|y+1|=0求5xy*-{2x*y-【3xy*-(4xy*-2x*y)】}的值
已知x-y=4,xy=-2,求代数式(2x+3y-2xy)-(x+4+xy)-(3xy+2y-2x)的值
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
1.已知x+y=-4,xy=3,求5(2分之1xy+2y)+[6x-(2xy+y-3x)]的值
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值