1.4/17*5 2.25/39*13/30 3.7/9*(2/3-2/7) 4.5/16*8/15 5.6/11*7/15*10 6.19/100*3/8*50脱式计算快快快快

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1.4/17*5 2.25/39*13/30 3.7/9*(2/3-2/7) 4.5/16*8/15 5.6/11*7/15*10 6.19/100*3/8*50脱式计算快快快快
1.4/17*5 2.25/39*13/30 3.7/9*(2/3-2/7) 4.5/16*8/15 5.6/11*7/15*10 6.19/100*3/8*50脱式计算快快快快

1.4/17*5 2.25/39*13/30 3.7/9*(2/3-2/7) 4.5/16*8/15 5.6/11*7/15*10 6.19/100*3/8*50脱式计算快快快快
1.4/17*5
=4*5/17
=20/17
2.25/39*13/30
=5/3*1/6
=5/18
3.7/9*(2/3-2/7)
=7/9*8/21
=8/9
4.5/16*8/15
=1/2*1/3
=1/6
5.6/11*7/15*10
=14/55*10
=28/11
6.19/100*3/8*50
=19/20*3/8
=57/160