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log3 72-3log3 2 怎么化简
人气:417 ℃ 时间:2020-04-07 16:15:18
解答
log3 72-3log3 2
=log3 72-log3 2³
=log3 72-log3 8
=log3 (72/8)
=log3 9
=log3 3²
=2log3 3
=2
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