若x^2-3x=1,则x^2y-3xy-y

若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( ) 若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y) 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少? 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x^2-3x=1,则x^2y-3xy-y 若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于? 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 若x=1/2,y=1 求x(x²+xy+y²)-y(x²+xy+y²)+3xy( 若1/x-1/y=1/3,求(2x+3xy-2y)/(x-3xy-y) 若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy) 若1/x-1/y=3 求 2x-3xy-2y/x-2xy-y的值