若x,y∈(0,+∞),12x+1y=1,则x+y
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
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X>1,Y>0,且满足XY=X的Y次方,X/Y=X的3Y次方,则X+Y等于?
1、x(x-y)(x+y)-x(x+y)^2
若x,y∈{-√3,-1,1,2},则(x,y)∈{(x,y)|x^2+y^2
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
(1)(x^2/x)-y-x-y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若实数x,y满足约束条件x-y≥0,x+y≥0,2x+y≤1,则y/(x+1)的最大值是多少,
若实数x,y满足x-y+1>=0,x+y>=0,x
若实数x,y满足x-y+1》=0,x+y>=0,x