4/5*1/4*5/8*40 (简算……= =)
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4/5*1/4*5/8*40 (简算……= =)
4/5*1/4*5/8*40 (简算……= =)
4/5*1/4*5/8*40 (简算……= =)
(4/5×5/8)*(1/4*40)=1/2*10=5
4/5*1/4*5/8*40 (简算……= =)
4/5*1/4*5/8*40 (简算……= =)
4/5*1/4*5/8*40 (简算……= =)
(4/5×5/8)*(1/4*40)=1/2*10=5