1. Give y = 1+x/1-x , find the value of x when y=5.
2. Given 1/u+1/v = 1/f , find the value of f when u=15 and v=30.
收錄日期: 2021-04-13 16:10:12
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https://hk.answers.yahoo.com/question/index?qid=20081016000051KK01580