已知x²+y²-2x-6y+10=0,求4(x²+y)(x²-y)-(2x
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
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+
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知x²+y²-2x+4y+5=0,求x+y
已知x²+4x+y-2y+5=0求x+2y
已知实数x,y满足x²+y²-xy+2x-y+1=0 求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