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log 243÷log9 =log3^5÷log3^2 =log3^5-log3^2 然后怎么写
人气:464 ℃ 时间:2020-02-01 09:40:42
解答
log 243÷log9
=log3^5÷log3^2
=5log3÷(2log3)
=5/2
=2.5
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