困難的數學題目 若x-1/y=5，xy+1/xy=22，求y-1/x=?
回答 (1)
2019-09-16 12:27 am
(x - 1/y)(y - 1/x) = xy + 1/(xy) - 2
5(y - 1/x) = 22 - 2
y - 1/x = 4
5(y - 1/x) = 22 - 2
y - 1/x = 4
收錄日期: 2021-04-11 22:59:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20190915155710AAc7UsF