5класс 2часть книги упр739

Пошаговое объяснение:

№ 1

1) 1. 4/5 * 1. 1/3 = 9/5 * 4/3 = 36/15 = 12/5 = 2,4

2) 11,9 - 2,4 = 9,5

№2

1) 83,2 - 80. 1/6 = 83. 2/10 - 80. 1/6 =

83. 6/30 - 80. 5/30 = 3. 1/30

2) 3. 1/30 * 3/13 = 91/30 * 3/13 = 7/10 * 1/1 = 7/10 или 0,7

№3

1) 16. 1/2 : 11 = 33/2 * 1/11 = 33/22 = 3/2 =

1. 1/2

2) 1. 1/2 + 9. 1/6 = 1. 3/6 + 9. 1/6 = 10. 4/6 = 10. 2/3

№4

1) 0,28 + 1. 1/3 = 28/1 00 + 1. 1/3 =

7/25 + 1. 1/3 = 21/75 + 1. 25/75 = 1. 46/75

2) 1. 46/75 : 11/30 = 121/75 * 30/11 =

11/5 * 2/1 = 22/5 = 4. 2/5 или 4,4