题目内容

化简下列各式:

(1)2log525+3log264;

(2)2log510+log50.25;

(3)log2(log216).

答案:
解析:

  解:(1)∵2log525=2log552=4log55=4,3log264=3log226=18log22=18,∴2log525+3log264=4+18=22.

  (2)∵2log510=log5100,∴2log510+log50.25=log5100+log50.25=log5(100×0.25)=log525=log552=2.

  (3)∵log216=log224=4,∴log2(log216)=log24=log222=2.


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