若(x-1)^2+|y-2|=0求多项式x^2y^2-3xy+4x^2y^2-2xy+5-3x^2y^2
已知:xy+x=-1,xy-y=-2,求多项式-x-[2y-2(xy+x)的平方+3x]+2[x+(xy-y)的平方]的
1、已知x+y=5,xy=3,求多项式2(x+3y-2xy)-(4x+8y-2xy)的值.
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知:3|x+1|+2(y-1)^2=0,求多项式(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
求多项式2x²-3xy+y²-2xy-2x²+5xy-2y+1的值,其中x=22/7,y=
已知x,y>0 2x+y+3=xy 求5x+4y最小值
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值