Выполните действия: 1 5/7: 1 1/7; 3 1/5: 2 2/15; - вопрос №674995915711731522155231317126 от icrupnov 14.07.2021 03:55

Question

Математика: Выполните действия: 1 5/7: 1 1/7; 3 1/5: 2 2/15; 5 2/3: 1/3-1 7/12*6

icrupnov · Answer

1 5/7 : 1 1/7 = 12/7 : 8/7 = 12/7 * 7/8 = 12/8 = 1 4/8 = 1 1/2
3 1/5 : 2 2/15 = 16/5 : 32/15 = 16/5 * 15/32 = (1*3)/(1*2) = 3/2 = 1 1/2

5 2/3 : 1/3 - 1 7/12 * 6 = 7 1/2
1) 5 2/3 : 1/3 = 17/3 * 3/1 = 17
2) 1 7/12 * 6 = 19/12 * 6 = 19/2 = 9 1/2
3) 17 - 9 1/2 = 16 2/2 - 9 1/2 = 7 1/2