中4 Ch5A 33,35,37,39 5B 2,9
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中4 Ch5A 33,35,37,39 5B 2,9
2007-11-14 2:14 am
回答 (1)
2007-11-14 2:29 am
✔ 最佳答案
33. 27a^2 (-27a^-2) = 27x27
=729
35. a^-6/b^-10
=b^10/a^6
37. 7^x=7^-2/3
so x = - 2/3
39. 5^3x/4=5^3
so 3x/4 =3
x =4
2.a 200=10^x
log200=xlog10
x= log200/log10
2b. 10^x=0.4
x =log0.4/log10
2c 10^x=3/4
x=log3/log4
收錄日期: 2021-05-02 13:36:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071113000051KK02331