1.已知(x²+y²)(x²-1+y²)-12=0,求x²+y
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知y+y'*x²=0,求y=?
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x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知(x²+y²)(x²+y²-1)-12=0 求x²+y²
已知(x²+y²)(x²-1+y²)-12=0,求x²+y²
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知x²-y²=12,x+y=6,求x,y的值
已知x²+y²-2x+4y+5=0,求x+y