几道简便计算,5/8+(2/3-5/8)6.39-4/7+3.61-3/71/5+1/8-1/5+7/8

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几道简便计算,5/8+(2/3-5/8)6.39-4/7+3.61-3/71/5+1/8-1/5+7/8几道简便计算,5/8+(2/3-5/8)6.39-4/7+3.61-3/71/5+1/8-1/5

几道简便计算,5/8+(2/3-5/8)6.39-4/7+3.61-3/71/5+1/8-1/5+7/8
几道简便计算,
5/8+(2/3-5/8)
6.39-4/7+3.61-3/7
1/5+1/8-1/5+7/8

几道简便计算,5/8+(2/3-5/8)6.39-4/7+3.61-3/71/5+1/8-1/5+7/8
5/8+(2/3-5/8)=5/8-5/8+2/3=2/3
6.39-4/7+3.61-3/7=(6.39+3.61)-(4/7+3/7)=10-1=9
1/5+1/8-1/5+7/8 =(1/5-1/5)+(1/8+7/8)=1