|x-1|+|y-2|=6,|x-1|=2y-4,求x,y的值
已知x+y=-6求[(x+y)^2-(x-y)^2+2y(y-x)]*1/4y的值
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x,y满足y^4+2x^4+1=4x^2y,求x,y的值
已知3x-4y/2x+y=1/2 求x/y的值
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
当x+y/x-y=1/2时,求代数式x-y/x+y-2x+2y/x-y的值
已知2x+y=10,求代数式((x+y)的平方-(x-y)的平方-2y(x-1/2y))/4y的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知X^2-6x+|y+1|=0,求(x+2y)^2(x-2y)^2-(x+2y)(x^2+4y^2)(x+2y)的值