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九又三分之一-3点二五的差÷2又二分之一+12点零五
=(9又1/3-3又1/4)÷2又1/2+12又1/20
=(9+4/12-3-3/12)÷5/2+12又1/20
=(6+1/12)*2/5+12又1/20
=6*2/5+1/12*2/5+12又1/20
=12/5+1/30+12又1/20
=72/30+1/30+12又1/20
=73/30+12又1/20
=2又13/30+12又1/20
=14+13/30+1/20
=14+26/60+3/60
=14+29/60
=14又29/60
=(9又1/3-3又1/4)÷2又1/2+12又1/20
=(9+4/12-3-3/12)÷5/2+12又1/20
=(6+1/12)*2/5+12又1/20
=6*2/5+1/12*2/5+12又1/20
=12/5+1/30+12又1/20
=72/30+1/30+12又1/20
=73/30+12又1/20
=2又13/30+12又1/20
=14+13/30+1/20
=14+26/60+3/60
=14+29/60
=14又29/60
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