已知-x+3y=5,则5(x-3y)-8(x-3y)-5的值为多少?

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知3X=5Y,则X:Y= 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 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+y-3|+（x-y）²=0则x=,y= 已知7Y=X-3,8Y=X+5 求X和Y 已知x,y满足x+3y=5,3x+y=-1,则x-y=? 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x)) 已知x-2y=2010,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值 已知:x-2y=2009,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x 的值 已知-x+3y=5,则5(x-3y)-8(x-3y)-5的值为多少? 已知x-2y=3,2x^2-8y^2=5,则x+2y=, 已知x-2y=3,2x^2-8y^2=5,则x+2y=