已知2X-3Y=-3,则5-2X+3Y的值是

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知1/x-1/y=3,则5x+3y-5y/x-2xy-y的值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为 已知x-y=-3y+5,则式子x+2y-1的值是? 已知x-2y/3y-x=2/3,则y/x的值是 已知x/y=2/3,则2x-y/x+2y的值是多少? 已知3x-2y/x+y=5/3求x；y的值 已知x+y/3x-2y=5/3求x；y的值 已知5|x+y-3|+(x-2y)²=5,求x+y的值 已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)= 已知x-y=3则5(x-y)-3x+3y-2= 已知x-y=3则5(x-y)-3x+3y-2= 已知5/x=3/y,求x+y/x+x-y/y-x^2-y^2/y^2的值 已知x/5=y/3,求x+y分之x+x-y分之y减y^2/x^2-y^2的值 已知2x=3y,则y分之x=< >,y分之x+y=< >. 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙