已知(x+y)^2-2x+2y+1=0,则(x+y)^999=
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知x,y满足约束条件:x-y+1>=0,x+y-2>=0,x
已知4x=9y求(1)x+y/y (2)y-x/2x
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x,y满足-5|x-2y|+8|y-1\2|=0则x=( ),y=( )
已知(x+y)²-2x-2y+1=0,则(x+y)^999=
已知(x+y)²-2x-2y+1=0,则(x+y)得999次方等于多少?
已知(2x+1)*2+y*2+2y+1=0 求{(x*2+y*2)-(x-y)*2+2y(x-y)}/(2y)
已知:x²y²-2x+6y+10=0则x+y=