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log(10)(25/9)减log(10)(7/4)减log(10)(1/9)加1/2log(10)(49)
人气:161 ℃ 时间:2020-04-06 08:25:54
解答
log(10)(25/9)减log(10)(7/4)减log(10)(1/9)加1/2log(10)(49)
=log(10)(25/9÷7/4÷1/9×7)
=log(10)100
=2
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