已知 1/x-1/y=2,求2x+5xy-2y/x-2xy-y
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/27 06:18:48
已知1/x-1/y=2,求2x+5xy-2y/x-2xy-y已知1/x-1/y=2,求2x+5xy-2y/x-2xy-y已知1/x-1/y=2,求2x+5xy-2y/x-2xy-y1/x-1/y=2,
已知 1/x-1/y=2,求2x+5xy-2y/x-2xy-y
已知 1/x-1/y=2,求2x+5xy-2y/x-2xy-y
已知 1/x-1/y=2,求2x+5xy-2y/x-2xy-y
1/x-1/y=2,
2x+5xy-2y/x-2xy-y
分子分母同时除以xy得
(2/y+5-2/x)/(1/y-2-1/x)
=[2(1/y-1/x)+5]/[(1/y-1/x)-2]
=[2x(-2)+5]/(-2-2)
=-1/4
1/x-1/y=2
(y-x)/xy=2
x-y=-2xy
2x+5xy-2y/x-2xy-y
=[2(x-y)+5xy]/[(x-y)-2xy]
=(-4xy+5xy)/(-2xy-2xy)
=xy/(-4xy)
=-1/4
由 1/x-1/y=2得：
(y-x)/xy=2
即y-x=2xy
故
（2x+5xy-2y）/（x-2xy-y）
=[2(x-y)+5xy]/[(x-y)-2xy]
=(-4xy+5xy)/(-2xy-2xy)
=xy/-4xy
=-1/4
已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值
已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值
【数学】已知 1/x-1/y=3 求 5x-xy-5y / x-2xy-y=?已知 1/x=1/y 求 2x-3xy-2y / x-2xy-y=?
已知(1/x)-(1/y)=5,求(2x+5xy-2y)/(x-2xy-y)
已知 1/x-1/y=2,求2x+5xy-2y/x-2xy-y
已知1/x-1/y=2,求5x+3xy-5y/x-2xy-y
已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y
已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值如题.
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
已知1/x-1/y=5,求分式y+xy-x/2x+7xy-2y的值.
已知1/x-1/y=5 求分式-x+xy+y/2x+7xy-2y
已知1/X-1/y=5,求分式(y+xy-x)/(2x+7xy-2y)的值
已知1/x+1/y=1/2,求代数式3x-5xy+3y/-x+3xy-y
已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值