Mathematics
SMA

想請問這題
答案是7

(2) log (3x+4)+log (5x+1)=2+log9
數b
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Answers

log a+log b=log(ab)
log(3x+4)(5x+1)=log100+log9
(3x+4)(5x+1)=900

也可用10的兩邊次方列式
10^(2+log9)=100*9...

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