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log3 5=a log3 7 =b 求log25 7
人气:298 ℃ 时间:2020-04-09 09:33:39
解答
log25 7
=log5² 7
=1/2 log5 7
=1/2(log3 7)/(log3 5)
=1/2×b/a
=b/(2a)
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