Verified answer

Номер 6.

а) 3/5 * 1/9 = 1/15

b) 1 2/7 * 2 1/3 = 9/7 * 7/3 = 3

в) 1 3/5 * 5/8 = 8/5 * 5/8 = 1

Номер 7.

а) 5/8 : 1/4 = 5/8 * 4/1 = 5/2 = 2,5

b) 1 1/6 : 7/15 = 7/6 * 15/7 = 15/6 = 2,5

в) 2 4/5 : 1 2/5 = 14/5 * 5/7 = 2

Номер 8.

2/7x = 3

x = 3 : 2/7

x = 3 * 7/2

x = 21/2

x = 10,5

Ответ: 10,5