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= 14/4 + 2/4
= 16/4
= 4
2 . 5/7 - 1/14 = 10/14 + 1/14
= 11/14
3 . 2/5 +1 3/4 = 2/5 + 7/4
= 8/20 + 35/20
=43/20
= 2 3/20
4 . 2 2/7 - 2 3/21 = 16/7 - 45/21
= 48/21 - 45/21
= 3/21 = 1/7
5 . 6 4/9 + 5/10= 58/9+5/10
=580/90 + 45/90
= 625/90
= 125/18
6 . langsung diubah kepecahan biasa
123/1000 + 36/10 = 123/1000 + 3600/1000
= 3723/1000
= 3,723
7 . langsung diubah kepecahan biasa
58/100 - 177/1000 = 580/1000 -177/1000 = 403/1000 = 0,403