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数学
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1/2log2(7/48)+log2 12-1/2log2 42
log2 的2 在g的右下脚
人气:181 ℃ 时间:2020-01-27 18:29:45
解答
原式=log2[√(7/48)]+log2(12)-log2(√42)
=log2[√(7/48)×12÷√42]
=log2[√(144/6×48)]
=log2[√(1/2)]
=log2[2^(-1/2)]
=-1/2
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log27/48+log212-1/2log242-2 log23=_.
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log2 SQR(7/48)+log2 12 -1/2log2 42
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log2为底数根号7/48为真数+log2为底数12为真数-1/2log2为底数42为真数=?
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