问题标题:
(-2/3)+(-1/6)+1/4-1/2
问题描述:
(-2/3)+(-1/6)+1/4-1/2
陈庆章回答:
原式
=-8/12-2/12+3/12-6/12
=(-8-2+3-6)/12
=-13/12
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(-2/3)+(-1/6)+1/4-1/2