64.83+5又18/19+35.17+44又1/19
=(64.83+35.17)+(5又18/19+44又1/19)
=100+50
=150
34又3/4-（2又3/19-15.25）
=34又3/4-2又3/19+15.25
=34又3/4+15.25-2又3/19
=34又3/4+15又1/4-2又3/19
=50-2又3/19
=47又16/19
2又1/2×5又7/11×12.5×0.032
=2.5×5又7/11×12.5×0.4×0.08
=5又7/11×(2.5×0.4)×(12.5×0.08)
=5又7/11×1×1
=5又7/11