1) 5:(-1.25) = -4
2) 2,8* 1/7 = 2 8/10 * 1/7 = 28/10 * 1/7 = 3/10 * 1/1 = 3/10
3) -4 + 3/10 = -3 10/10 + 3/10 = 3 10/10 - 3/10 = -3 7/10
4) -3 7/10 + 1/3 = -3 21/30 + 10/30 = 3 21/30 - 10/30 = -3 11/30
Второй пример
1) 10 - 3 7/15 = 9 15/15 - 3 7/15 = 6 8/15
2) 9,8 : 6 8/15 = 9 8/10 ; 6 8/15 = 98/10 * 15/90 = 147/90 = 1 57/90 = 1 19/30
3) 1 19/30 * 1 1/27 = 49/30 * 28/27 = 686/405 = 1 281/405