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1/log5^7+1/log3^7+1/log2^7 ,求值
人气:150 ℃ 时间:2020-01-31 06:22:39
解答
1/log5^7+1/log3^7+1/log2^7
=log7^5+log7^3+log7^2
=log7^(5*3*2)
=log7^30
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