x²+y²减2x+4y+5,求x和y的值
已知x² +y²+5/4=2x+y,求y-x的值
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
|x+y+2|+(2x+3y+5)²=0 求x y的值.
实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值
求5x²y、﹣2x²y、2xy²、﹣4x²y的和
如果(2x-3y+5)²+|x+y-2|=0,求x和y的值.
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知x>2y,xy=1,求(x²+4y²)/(x-2y)的最小值和此时x、y的值
如果2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y的值