化简式子根号下(1-lg12)^2 -lg12

问题描述:

化简式子根号下(1-lg12)^2 -lg12

因1<lg12
√(1-lg12)^2 -lg12
=(lg12-1)-lg12
= -1
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根号下(1-lg12)^2 -lg12
=lg12-1-lg12
=-1