若log2=a及log7=b,以a及b表log35?

2007-03-14 6:55 pm

若log2=a及log7=b,以a及b表log35?

是這樣做嗎?
=log7+log5
=log7+log(2乘2.5)
=log7+log2+log2.5
=b+a+log2.5

回答 (3)

2007-03-15 1:39 am

✔ 最佳答案

log 35

=log (7 x 5)
=log7+log5
=log7+log 10/2
=log7+ log10- log2

(log 10 =1)

= log7 +1 -log2
= 1+b-a

=]?

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2007-03-15 6:10 am

log35
=log(7x5)
=log7+log5
=b+log(10/2)
=b+log10-log2
=b+1+a(這是答案)

參考: 學校阿sir給我的筆記~

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2007-03-14 7:03 pm

=log(7*5)
=log7+log5
=log7+log10/2
=log7+log10-log2
=log7+1-log2
=1+b-a

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