|x-2/1|+(2y+1)^2=0则x^2+y^3
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
|2x+y+1|+√2y+3x=0则x.y=
1、x(x-y)(x+y)-x(x+y)^2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
2(x+y) 3x+3y=24 x+y/2x x y/2y= 1
(1)(x^2/x)-y-x-y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1