log 3的三分之四倍根号27+log 25+log 4+7的log 72等于多少?
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发布时间:2024-10-03 00:22
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时间:2024-10-03 08:53
解:
4/3·√27log3+log25+log4十7log72
=4log3+2log5+2log2+7(log8+log9)
=4log3+2log5+2log2+21log2+21log3
=25log3+2log5+23log2
=25X0.47712+2x0.699+23x0.301
=11.928+1.398+6.923
=13.326+6.923
=20.249