Question

помогите даю 50 балловппжжппю и по быстрее​

Answer 1

Ответ:

1. (34/7 - 3/28+ 5/14) × 28/135 = 143/28 × 28/135= 143 × 1/135= 143/135

2. (3 + 61/45) × 15/49= (3+1+ 16/45) × 15/49= (4+16/45) × 15/49 = 196/45× 15/49= 4/3

3.( Х- 2/15) × 18/5 = 54/25

18/5Х - 12/25 = 54/25

90Х - 12 = 54

90Х= 12+54

90Х=66

Х=11/15

Answer 2

Пошаговое объяснение:

№1

1) 4 6/7 - 3/28 + 5/14 = 4 24/28 - 3/28 + 10/28 = 4 31/28 = 5 3/28

2) 1/5 + 1/135 = 27/135 + 1/135 = 28/135

3) 5 3/28 * 28/135 = 143/28 * 28/135 = 143/135 = 1 8/135

№2

1) 2 8/9 + 1 7/15 = 2 40/45 + 1 21/45 = 3 61/45 = 4 16/45

2) 1/7 + 8/49 = 7/49 + 8/49 = 15/49

3) 4 16/45 * 15/49 = 196/45 * 15/49 = 4/3 * 1/1 = 4/3 = 1 1/3

№3

(х - 2/15) : 5/18 = 2 4/25

х - 2/15 = 2 4/25 * 5/18

х - 2/15 = 54/25 * 5/18

х - 2/15 = 3/5

х = 3/5 + 2/15

х = 9/15 + 2/15

х = 11/15