化简y²-2x²-6y+4x+2=0
化简:(2x-y)²-4(x-y)(x+y)
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
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X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(2x-y)²-4(x-y)(x+2y)
已知x²+4x+y²+6y+13=0,求x-y+(2y²/x+y) 请在10;20分前回答
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知:x²y²-2x+6y+10=0则x+y=
x²-2x+y²+6y+10=0,则x+y=?
已知x²+4x+y²-2y+5=0,则x+y=
已知x²+y²-2x+4y+5=0,求x+y