1.已知x-5y=-3,则15-2x+10y等于多少?

1.y=x^5+5^x+x^x+lgx 2.y=xe^x^2求y'' 3.已知y=e^f(x),则y''= 4.已知y=(1+x)^x,求导数y' 1 已知1/X+1/Y=1/X+Y 则 Y/X+X/Y=2 已知1/X-1/Y=5,则3X+5XY-3Y/X-3XY-Y= 1.已知x-5y=-3,则15-2x+10y等于多少? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知1/x-1/y=3,则5x+3y-5y/x-2xy-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-y=3则5(x-y)-3x+3y-2= 已知x-y=3则5(x-y)-3x+3y-2= 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 已知x,y满足x+3y=5,3x+y=-1,则x-y=? 已知1/x=3+1/y,则(2x-5xy-2y)/(y+3xy-x)=_______. 已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y= 已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知1/x-1/y=5,则2x+3xy-2y/y+2xy-x 已知2x+3=-5y,求4x+10y-1除以6x+15y的值