计算,①31/50+4/5-9/20②3/4-5/12+2/3③1-1/6-1/3-1/2④3/8+(7/12+5/6)急

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计算,①31/50+4/5-9/20②3/4-5/12+2/3③1-1/6-1/3-1/2④3/8+(7/12+5/6)急
计算,①31/50+4/5-9/20②3/4-5/12+2/3③1-1/6-1/3-1/2④3/8+(7/12+5/6)

计算,①31/50+4/5-9/20②3/4-5/12+2/3③1-1/6-1/3-1/2④3/8+(7/12+5/6)急
1,通分62/100+80/100-45/100=97/100 .2,通分9/12-5/12+8/12=1.4,9/24+14/24+20/24=43/20 3,6/6-1/6-2/6-3/6=0

计算,写过程
①31/50+4/5-9/20
=0.62+0.8-0.45
=0.97
②3/4-5/12+2/3
=1/3+2/3
=1
③1-1/6-1/3-1/2
=1-(1/6+1/3+1/2)
=1-1
=0
④3/8+(7/12+5/6)
=3/8+17/12
=43/12
=3又7/12