1) 2 1/3 + 0,25 = 7/3 + 25/100 = 7/3 + 1/4 = (7 × 4 + 1 × 3)/12 = (28 + 3)/12 = 31/12 = 2 7/12
2) 2 7/12 * 0,12 = 2 7/12 * 12/100 = 31/12 * 3/25 = 31/100
ответ 31/100
1) 7,6 - 4 3/4 = 7 6/10 - 4 3/4 = 76/10 - 19/4 = 38/5 - 19/4 = (38 × 4 - 19 × 5)/20 = (152 - 95)/20 = 57/20 = 2 17/20
2) 2 17/20 : 1,9 = 2 17/20 : 1 9/10 =57/20 : 19/10 = 57/20 * 10/19 = 3/2 = 1 1/2
ответ 1 1/2