Question

1) (1 3/5+1,8)*1/2 2) (6-4 8/15:2,2

Answer 1

Пошаговое объяснение:

это первое

второй пример точно верный?

Answer 2

Let's simplify each of these mathematical expressions step by step:

1. (1 3/5 + 1.8) * 1/2

First, convert the mixed number 1 3/5 to an improper fraction:

1 3/5 = (5 * 1 + 3) / 5 = 8/5

Now, the expression becomes:

(8/5 + 1.8) * 1/2

Next, add the fractions:

(8/5 + 1.8) = (8/5 + 9/5) = 17/5

Now, the expression is:

(17/5) * 1/2

To multiply fractions, simply multiply the numerators together and the denominators together:

(17/5) * (1/2) = (17 * 1) / (5 * 2) = 17/10

So, the result of the first expression is 17/10 or 1.7 when expressed as a decimal.

2. (6 - 4 8/15) / 2.2

First, convert the mixed number 4 8/15 to an improper fraction:

4 8/15 = (15 * 4 + 8) / 15 = 68/15

Now, the expression becomes:

(6 - 68/15) / 2.2

Next, subtract the fractions:

6 - 68/15 = (90/15) - (68/15) = (90 - 68) / 15 = 22/15

Now, the expression is:

(22/15) / 2.2

To divide by a decimal, multiply by its reciprocal (1 divided by the decimal):

(22/15) / 2.2 = (22/15) * (1/2.2)

Now, multiply the fractions:

(22/15) * (1/2.2) = (22 * 1) / (15 * 2.2) = 22/33

So, the result of the second expression is 22/33.