若a,b,lg6,lg2+2lg3成等差数列,则a+b=?
人气:484 ℃ 时间:2020-06-30 06:22:13
解答
公差为lg2+2lg3-lg6=lg2*9/6=lg3
b=lg6-lg3=lg2
a=lg2-lg3=lg(2/3)
所以a+b=lg2+lg(2/3)=lg(4/3)
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