x²+y²-2x-6y+10=0,求4(x²+y)(x²-y)-(2x²
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
x²+4y²-2x+12y+10=0求X,Y值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
已知x²+4x+y²+6y+13=0,求x-y+(2y²/x+y) 请在10;20分前回答
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知4x²+y²-4x-6y+10=0,求[(2/3)x√(9x)+y²√(x/y
已知4x²+y²-4x-6y+10=0,求(2/3√9x+y²√x/y³)-(x