X+Y=1/8.XY=1.5求X,Y

1/x-1/y=x,求5y+xy-5y/y-xy-x=? 1+x+y=xy,求整数x、y X+Y=1/8.XY=1.5求X,Y 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y |x|/x+y/|y|+xy/|xy|= 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 1-2/x+y=xy,4y+6x=xy.求xy的解? 已知x×x×y×y+x×x+y×y+1=4xy,求x,y的值快 x+y=1,xy=-2求(x²+y²+xy)/(x²+y²-xy) 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值. x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2 已知x+y=1,xy=-二分之一,求x（x+y)(x-y)-x(x+y)² 已知x+y=1,xy=-二分之一,求x（x+y)(x-y)-x(x+y)² sin(x*x+y)=xy 求y'x 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值 f(x,y)=xy+e^x x arctanx/y ,求f(x+y,x-y) 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值