已知1⼀x-1⼀y=3.则代数式(2x+3xy-2y)⼀(x-2xy-y)..

2024-10-30 20:12:06
推荐回答(4个)
回答1:

1/X-1/Y=3
(2x+3xy-2y)/(x-2xy-y)
分子分母同除以xy
=(2/y+3-2/x)/(1/y-2-1/x)
=(-2*3+3)/(-3-2)
=3/5

回答2:

1/X-1/Y=3
2X+3XY-2Y/X-2XY-Y
分子分母同除以xy
=(2/y+3-2/x)/(1/y-2-1/y)
=(2*3+3)/(1*3-2)
=9/1
=9

回答3:

1/x-1/y=3,则y-x=3xy
(2x+3xy-2y)/(x-2xy-y)
=(2x-2y+3xy)/(x-y-2xy)
=(-6xy+3xy)/(-3xy-2xy)
=3/5

回答4:

(2x+3xy-2y)/(x-2xy-y)
=0.6