简算8/15*1/14*63/65 19/102*101 (4/5+8/9)*40
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发布时间:2022-06-08 22:54
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时间:2023-09-11 11:38
1、乙:60×1/4=15丙:15×1/3=5丙是甲的:5/60=1/12
2、3,4,5,6
1/3+1/4+1/5+1/6=(20+15+12+10)/60=57/60
3、A和D
4、8/15*1/14*63/65
=8/15×1/2×1/7×63/65
=4/15×9/65
=36/975
5、19/102*101
=19/102×(102-1)
=19/102×102-19/102
=18+1-19/102
=18+83/102
18又102分之83
6、(4/5+8/9)*40
=4/5×40+320/9
=32+320/9
=32×(1+10/9)
=32×19/9
=32×(20-1)/19
=(640-32)/19
=608/9