1.

а)  4/5 +  7/40 = 32/40 + 7/40 = 39/40

б)  6/7 - 1/2 = 12/14 - 7 /14 = 5/14

в) 5 - 4 6/11 = 55/11 - 50/11 = 5/11

г) 1 15/16 + 7 1/6 = 31/16 + 43/6 = 93/48 + 344/48 = 437/48

д) 4 7/12 - 1 7/30 = 55/12 - 37/30 = 275/60 - 74/60 = 201/60

е) 2 3/25 - 1 7/15 = 53/25 - 22/15 = 159/75 - 110/75 = 49/75

2.

а) 9/26. 13/45 = 1/2 . 1/5 = 1/10

б) 49/18. 9/19 . 38/7 = 7/2. 1/1 . 2/1 = 14/2 = 7

в) 5 . 7/15 = 1. 7/3 = 7/3