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-1-{1-[2-0.5乘以(-3分之1)]}
人气:303 ℃ 时间:2020-06-02 14:02:34
解答
-1-{1-[2-0.5乘以(-3分之1)]}
=-1-(1-(2-1/2*(-1/3)))
=-1-(1-(2+1/6))
=-1-(1-13/6)
=-1-(-7/6)
=-1+7/6
=1/6
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