已知(x²+y²)²+(x²+y²)-12=0,求x²+y&
已知y+y'*x²=0,求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=12,x+y=6,求x,y的值
已知x²+y²-2x+4y+5=0,求x+y
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
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
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.