a) Simplify (X^-1 + y^-1) / (y/x - x/y)
b) Solve X/4 + X/2 < 1
thanks
收錄日期: 2021-05-01 18:32:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120312000051KK00480