|2x-y-2|+(2x+y+10)²=0,则,( )
已知:x²y²-2x+6y+10=0则x+y=
x²-2x+y²+6y+10=0,则x+y=?
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)=
已知x²+4x+y²-2y+5=0,则x+y=
x²+4y²-2x+12y+10=0求X,Y值