若x,y∈{-√3,-1,1,2},则(x,y)∈{(x,y)|x^2+y^2
若x,y∈{-√3,-1,1,2},则(x,y)∈{(x,y)|x^2+y^2
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(
1、x(x-y)(x+y)-x(x+y)^2
(1)(x^2/x)-y-x-y
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
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
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2