【1又1/24-（3/8+1/6-3/4）*24】/5
=(1又1/24-3/8*24-1/6*24+3/4*24)/5
=(1又1/24-9-4+18)/5
=(6又1/24)/5
=(145/24)/5
=29/24
=1又5/24
[(1+1/24)-(3/8+1/6-3/4)*24]/5
=[1+1/24-24*3/8-24*1/6+24*3/4]/5
=[1+1/24-9-4+18]/5
=(6+1/24)/5
=(144/24+1/24)/5
=(145/24)/5
=145/24*1/5
=29/24
=1+5/24
=1又5/24
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