Ответ:

Пошаговое объяснение:

1.

1) 1. 3/5 + 1,8 =

1. 3/5 + 1. 8/10 =

1. 3/5 + 1. 4/5 =

2. 7/5 = 3. 2/5

2) 3. 2/5 * 1/2 = 17/5 * 1/2 = 17/10 = 1,7 или 1. 7/10

2.

1) 6 - 4. 8/15 =

5. 15/15 - 4. 8/15 = 1. 7/15

2) 1. 7/15 : 2,2 =

1. 7/15 : 2. 2/10 =

22/15 : 22/10 = 22/15 * 10/22 = 10/15 = 2/3

3.

1) 1,25 + 1/6 =

1. 25/100 + 1/6 =

1. 1/4 + 1/6 =

1. 3/12 + 2/12 = 1. 5/12

2) 1. 5/12 * 2,4 =

1. 5/12 * 2. 4/10 =

17/12 * 24/10 = 17/1 * 2/10 = 34/10 = 3. 4/10 = 3. 2/5 или 3,4

4.

1) 5,4 - 2. 1/3 =

5. 4/10 - 2. 1/3 =

5. 12/30 - 2. 10/30 =

3. 2/30 = 3. 1/15

2) 3. 1/15 : 7. 2/3 =

46/15 : 23/3 = 46/15 * 3/23 = 2/5 * 1/1 = 2/5

5.

1) 2. 1/3 + 0,25 =

2. 1/3 + 25/100 =

2. 1/3 + 1/4 = 2. 4/12 + 3/12 = 2. 7/12

2) 2. 7/12 * 0,12 =

2. 7/12 * 12/100 = 31/12 * 3/25 = 31/4 * 1/25 = 31/100 = 0,31

6.

1) 7,6 - 4. 3/4 =

7. 6/10 - 4. 3/4 =

7. 12/20 - 4. 15/20 =

6. 32/20 - 4. 15/20 =

2. 17/20

2) 2. 17/20 : 1,9 =

2. 17/20 : 1. 9/10 =

57/20 : 19/10 = 57/20 * 10/19 = 3/2 * 1/1 = 3/2 = 1. 1/2 или 1,5