已知,1/x-1/x=-3,求(5x-xy-y)/(x-..
已知1/x-1/x=3,求x-xy-y分之5x+xy-5y的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x+1/y=5,求(3x-5xy+3y)/(x+xy+y)的值?
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x+1/y=3,求(3x-5xy+3y)/(x-2xy+y)
已知1/X-1/Y=-2,求3X-5XY-3Y/-X+3XY+Y的值
已知1/x-1/y=3,求代数式5x+xy-5y除以x-xy-y的值.
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy