1) - 21 7/20 + 27 3/8 = - 21 14/40 + 27 15/40 = 6 1/40
2) - 1 23/28 + 3 4/7 = - 1 23/28 + 3 16/28 = - 1 23/28 + 2 44/28 = 1 21/28 =
= 1 3/4
3) - 29/130 + 1 47/65 = - 29/130 + 1 94/130 = 1 65/130 = 1 1/2
4) 1 3/4 - 1 1/2 = 1 3/4 - 1 2/4 = 1/4
5) 6 1/40 : 1/4 = 241/40 : 1/4 = 241/10 = 24,1
ОТВЕТ 24,1