求y=x/(2x-1) (1
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
x(x-1)-(x平方-y)=-3,求x平方+y平方-2xy
已知4x=9y求(1)x+y/y (2)y-x/2x
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
(1)正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y)
已知x=3分之1,y=二分之一,求代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+13y)的值
x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2
利用因式分解求x(x+y)(x-y)-x(x+y)平方,其中x+y=1,xy=2/1
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)
已知x+y=1,xy=-2分之1,利用因式分解求:x(x+y)(x-y)-x(x+y)²的值
已知,x+y=2,xy=-1,求下列代数式的值:x(x+y)(x-y)-x(x+y)的平方