1/x-1/y=x,求5y+xy-5y/y-xy-x=?
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值
已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(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=3,求代数式5x+xy-5y除以x-xy-y的值.
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
已知1/x+1/y=5,求(3x-5xy+3y)/(x+xy+y)的值?
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
若1/x+1/y=5,求3x+4xy+3y/x+3xy+y的值
已知1/x-1/y=5 求分式-x+xy+y/2x+7xy-2y