若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 01:24:51
若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值
x){ѽPBP'umlzèB۸RרN} Bjyڰ&H|v6 ik iTVhW@-0i J[]`F@ 56PA,XVC׬$2$l{f=Yd⧭K gl_\g<N$

若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值
若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值

若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值
1/x-1/y=3
(y-x)/xy=3
y-x=3xy
即x-y=-3xy
(2x+3xy-2y)/(x+2xy-y)
[2(x-y)+3xy]/[(x-y)+2xy]
=(-6xy+3xy)/(-3xy+2xy) (注:把x-y=-3xy代入得)
=3