已知1/x-1/y=2,求3x+5xy-3y/x-xy-y
人气:483 ℃ 时间:2020-01-30 17:17:53
解答
将1/x-1/y=2通分可得:y-x=2xy,那么x-y=-2xy
分子3x+5xy-3y=3*(x-y)+5xy=3*(-2xy)+5xy=-xy
分母x-xy-y=(x-y)-xy=-2xy-xy=-3xy
所以3x+5xy-3y/x-xy-y=-xy/-3xy=1/3
推荐
猜你喜欢
- 若x^3+p^2x^2+px+1能被x+1整除,求P值
- 将下列句子变为被动语态
- 已知向量a+向量b+向量c=0向量,IaI=2,IbI=3,IcI=根号19,求向量a与向量b之间的夹角
- How can i love when i m afraid to fall这句英文是什么意思
- 用一个四字词语或成语概括《牧童》,《舟过安仁》和《清平乐.村居》
- 翻译it takes more to take a coach to Chengdu nowadays as the fares have all gone up.
- 表达思乡情感的古诗?
- have,game,do,a,you,computer把它们连成句子