1) (2 1/3+ 0,25)*0,12 2) (7,6-4 3/4): 1,9 - вопрос №4142519121302501227643419 от unicorn1213 19.11.2022 07:06

Question

Математика: 1) (2 1/3+ 0,25)*0,12 2) (7,6-4 3/4): 1,9

unicorn1213 · Answer

2 1/3 + 0.25 = 2 1/3 + 25/100 = 7/3 + 1/4 = (7 × 4 + 1 × 3)/12 = (28 + 3)/12 = 31/12 = 2 7/12
2 7/12 * 0.12 = 2 7/12 × 12/100 = 31/12 × 3/25 = 31/100
ответ 31/100
7,6 - 4 3/4 = 7 6/10 - 4 3/4 = 38/5 - 19/4 = (38 × 4 - 19 × 5)/20 = (152 - 95)/20 = 57/20 = 2 17/20 = 2,85
2,85 : 1,9 = 1,5
ответ 1,5