**Решение:**
1) 2/15 + (-3/10) = 4/30 - 9/30 = -5/30 = -1/6
2) -2/5 + 13/15 = -6/15 + 13/15 = 7/15
3) 13/16 + (-0/32) = 13/16 + 0 = 13/16
4) -4/5 + (-7/4) = -16/20 - 35/20 = -51/20 = -2 11/20
5) -5 7/8 * (-6 3/10) = -47/8 * (-63/10) = 2961/80 = 37 1/80
6) -5 18/18 + 12 11/12 = -6 + 12 11/12 = 6 11/12
7) -13 + 7 3/16 = -5 13/16
8) -2 3/8 + (-1 5/6) = -19/8 - 11/6 = -57/24 - 44/24 = -101/24 = -4 5/24
9) -8 + 4 5/22 = -3 17/22
10) -2 9/20 - 5 7/30 = -49/20 - 157/30 = -147/60 - 314/60 = -461/60 = -7 41/60
11) -5 1/2 + 1 1/5 = -11/2 + 6/5 = -55/10 + 12/10 = -43/10 = -4 3/10
12) 4 3/7 + (-8 9/14) = 31/7 - 121/14 = 62/14 - 121/14 = -59/14 = -4 3/14
**Ответы:**
1) -1/6
2) 7/15
3) 13/16
4) -2 11/20
5) 37 1/80
6) 6 11/12
7) -5 13/16
8) -4 5/24
9) -3 17/22
10) -7 41/60
11) -4 3/10
12) -4 3/14