(1)7/8*1/6÷7/9(2)12*(5/6+5/12)(3)20-2/7*7/10+1/5(4)18/13÷39-5/13*1/39能简便就简便
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 02:10:42
![(1)7/8*1/6÷7/9(2)12*(5/6+5/12)(3)20-2/7*7/10+1/5(4)18/13÷39-5/13*1/39能简便就简便](/uploads/image/z/114381-45-1.jpg?t=%EF%BC%881%EF%BC%897%2F8%2A1%2F6%C3%B77%2F9%EF%BC%882%EF%BC%8912%2A%EF%BC%885%2F6%2B5%2F12%EF%BC%89%EF%BC%883%EF%BC%8920-2%2F7%2A7%2F10%2B1%2F5%EF%BC%884%EF%BC%8918%2F13%C3%B739-5%2F13%2A1%2F39%E8%83%BD%E7%AE%80%E4%BE%BF%E5%B0%B1%E7%AE%80%E4%BE%BF)
(1)7/8*1/6÷7/9(2)12*(5/6+5/12)(3)20-2/7*7/10+1/5(4)18/13÷39-5/13*1/39能简便就简便
(1)7/8*1/6÷7/9(2)12*(5/6+5/12)(3)20-2/7*7/10+1/5(4)18/13÷39-5/13*1/39能简便就简便
(1)7/8*1/6÷7/9(2)12*(5/6+5/12)(3)20-2/7*7/10+1/5(4)18/13÷39-5/13*1/39能简便就简便
1)原式=7÷8×1÷6÷7×9
=(7×9)/(7×6×8)
=3/16
2)原式=12×5/6+12×5/12
=10+5
=15
3)原式=20-1/5+1/5
=20
4)原式=18/13×1/39-5/13×1/39
=(18/13-5/13)×1/39
=1×1/39
=1/39