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谁会这几道log的数学题
log4 16 ×log9 8=?
3^(2+log32)=?
5^(2-log5 3)=?
人气:494 ℃ 时间:2020-06-24 11:37:51
解答
1.log4 (16) ×log9( 8)
=log2^2(2^4)*log3^2(2^3)
=2log2 (2)*3/2log2(3)
=2*3/2log2(3)
=3log2(3)
2.3^(2+log32)
=3^2*3^log3(2)
=9*2
=18
3.5^(2-log5 3)
=5^2/5^log5(3)
=25/3
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