Question

1) 2 4/5 : 0,7 - 1,8 = 3) 3/5 : 0,25 + 0,6 = 5) 0,3 * 1 4/5 - 0,24 = 2) 6 : 3/4 + 1,2 = 4)1,6 * 1/2 + 3,2 = 6) 0,8 * 1 1/4 + 5,6 \ вот это дробь

Answer 1

Ответ:

Пошаговое объяснение:

1) 2 4/5 : 0,7 - 1,8 = 14/5 : 7/10 - 1,8 = 14/5 * 10/7 - 1,8 = 2/1 * 2/1 - 1,8 = 4 - 1,8 = 2,2

3) 3/5 : 0,25 + 0,6 = 3/5 : 25/100 + 0,6 = 3/5 : 1/4 + 0,6 = 3/5 * 4/1 - 0,6 = 12/5 - 0,6 = 2,4 - 0,6 = 1,8

5) 0,3 * 1 4/5 - 0,24 = 3/10 * 9/5 - 0,24 = 27/50 - 24/100 = 27/50 - 12/50 = 15/50 = 3/10 = 0,3  

2) 6 : 3/4 + 1,2 = 6/1 * 4/3 + 1,2 = 2/1 * 4/1 + 1,2 = 8 + 1,2 = 9,2

4)1,6 * 1/2 + 3,2 = 16/10 * 1/2 + 3,2 = 8/5 * 1/2 + 3,2 = 8/10 + 3,2 = 0,8 + 3,2 = 4

6) 0,8 * 1 1/4 + 5,6 = 8/10 * 5/4 + 5,6 = 2/2 + 5,6 = 1 + 5,6 = 6,6

Answer 2

To solve these expressions, let's follow the order of operations (PEMDAS/BODMAS) and work through each one step by step:

1. 2 4/5 : 0.7 - 1.8

First, convert the mixed number to an improper fraction: 2 4/5 = (2 * 5 + 4) / 5 = 14/5

Now, perform the division: 14/5 : 0.7 = (14/5) / (7/10) = (14/5) * (10/7) = 20/7

Finally, subtract 1.8: 20/7 - 1.8 = (20 - 1.8*7) / 7 = (20 - 12.6) / 7 = 7.4 / 7 = 1.057142857...

2. 6 : 3/4 + 1.2

Convert the whole number to a fraction with a denominator of 1: 6 = 6/1

Now, perform the division: 6/1 : 3/4 = (6/1) * (4/3) = 24/3 = 8

Finally, add 1.2: 8 + 1.2 = 9.2

3. 3/5 : 0.25 + 0.6

Perform the division: 3/5 : 0.25 = (3/5) / (1/4) = (3/5) * 4 = 12/5

Now, add 0.6: 12/5 + 0.6 = (12/5) + (6/10) = (24/10) + (6/10) = 30/10 = 3

4. 1.6 * 1/2 + 3.2

Convert the decimal to a fraction: 1.6 = 1 6/10 = 1 3/5

Now, perform the multiplication: 1 3/5 * 1/2 = (8/5) * (1/2) = 8/10 = 4/5

Finally, add 3.2: 4/5 + 3.2 = (4/5) + (16/5) = (4+16)/5 = 20/5 = 4

5. 0.3 * 1 4/5 - 0.24

Convert the mixed number to an improper fraction: 1 4/5 = (1 * 5 + 4) / 5 = 9/5

Now, perform the multiplication: 0.3 * 9/5 = 2.7/5

Finally, subtract 0.24: 2.7/5 - 0.24 = (2.7 - 1.2) / 5 = 1.5/5 = 3/10

6. 0.8 * 1 1/4 + 5.6

Convert the mixed number to an improper fraction: 1 1/4 = (1 * 4 + 1) / 4 = 5/4

Now, perform the multiplication: 0.8 * 5/4 = 4/5

Finally, add 5.6: 4/5 + 5.6 = (4+28)/5 = 32/5 = 6.4

So, the solutions are:

1. 2 4/5 : 0.7 - 1.8 ≈ 1.057142857...
2. 6 : 3/4 + 1.2 = 9.2
3. 3/5 : 0.25 + 0.6 = 3
4. 1.6 * 1/2 + 3.2 = 4
5. 0.3 * 1 4/5 - 0.24 = 3/10
6. 0.8 * 1 1/4 + 5.6 = 6.4