怎样用简便方法计算急‼

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怎样用简便方法计算急‼
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怎样用简便方法计算急‼
怎样用简便方法计算急‼
 

怎样用简便方法计算急‼

5/8+1/8-3/10-1/10
=(5/8+1/8)-(3/10+1/10)
=6/8-4/10
=3/4-2/5
=15/20-8/20
=7/20