这个怎么提?一开始就是套公式：
log2 42 -log 2 32
=log2 42/32
=log2 21/16
=log2 21-log2 16(log2 16=log2 2x2x2x2=4 )
=log2 21-4
怎么把log2 42 -log 2 32的log2提出去
2个回答
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