问题标题:
(-21/2)+(+5/6)+(-0.5)+(+1/6)
问题描述:
(-21/2)+(+5/6)+(-0.5)+(+1/6)
冯钟葵回答:
(-21/2)+(+5/6)+(-0.5)+(+1/6)
=-(21/2+0.5)+(5/6+1/6)
=-11+1
=-10
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(-21/2)+(+5/6)+(-0.5)+(+1/6)