若x²-4x+|3x-y|=-4,求y²的值
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.
若x-y-2次根号x+y+4 是x+y+4的立方根,且其值为3,求x²;+y²;x²+y&
已知x-y=4,x²-y²=20,求x-y的值
已知x² +y²+5/4=2x+y,求y-x的值
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x、y是实数,且x²+y²-4x-6y+12=0.求x²+y²的最值,x-y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²的值