已知x+y分之xy=2,求-x+3xy-y分之3x-5xy+3y的值

来源：学生作业帮助网编辑：作业帮时间：2024/11/06 03:37:27

已知x+y分之xy=2,求-x+3xy-y分之3x-5xy+3y的值
已知x+y分之xy=2,求-x+3xy-y分之3x-5xy+3y的值

已知x+y分之xy=2,求-x+3xy-y分之3x-5xy+3y的值
x+y分之xy=2,
则
xy/(x+y)=2
xy=2x+2y
(-x+3xy-y)分之(3x-5xy+3y)
=(3x-5xy+3y)/(-x+3xy-y)
=[3x-5(2x+2y)+3y)/[-x+3(2x+2y)-y]
=(3x-10x-10y+3y)/(-x+6x+6y-y)
=(-7x-7y)/(5x+5y)
=[-7(x+y)]/[5(x+y)]
=-7/5
=-1.4

xy/(x+y)=2
xy=2(x+y)
(3x-5xy+3y)/(-x+3xy-y)
=(3(x+y)-5*2(x+y))/(-(x+y)+3*2(x+y))
=-7(x+y)/(5(x+y))
=-7/5

已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 已知x分之1+y分之1=3,求2x-3xy+2y分之x+xy+y. 已知2x-2y=xy,求代数式3x-4xy-3y分之xy的值已知X+Y分之XY等于3,求-X+3XY-Y分之2X-3XY+2Y 已知y分之x=3,求x²-xy+y²分之x²+2xy-3y² 已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值已知x-y分之xy= - 3分之1,求x-2xy-y分之2x+3xy-2y的值已知x(x-1)-(x^2-y)=-3求（二分之y-x+2xy)-xy 快, 已知x分之一-y分之一=3,求x+xy-y分之3x-2xy-3y的值已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y= 已知x+y=5分之1,xy=-2分之1,求(x+3x-3xy)-2(xy-2x-y) 已知x+y分之xy=3求-2x+3xy-2y分之3x-5xy+3y的值已知x+y分之xy=3,求-x+3xy-y分之2x-3xy+2y的值已知x+y分之xy=3求3xy-x-y分之2x-3xy+2y的值-_,.. 已知xy分之x+y=3,求-x+2xy-y分之2x-3xy+2y/的值已知x+y分之xy=2,求-x+3xy-y分之3x-5xy+3y的值已知多项式x+y分之xy=2,求代数式-x+3xy-y分之3x-5xy+3y的值