Question

Наидете значение выражение 1) (2/7+3 1/1) * 4 2/3. 3)(5 6/7+3 5/21) 2) (4 1/5 -2 3/4) *2 2/19 ; 4) (7 5/12 -3

Answer 1

Ответ:

1) 18 2/3

2)3 1/19

3)9 2/21

4) 4 5/12

Answer 2

1. (2/7 + 3 1/1) * 4 2/3:

To solve this expression, we need to convert the mixed numbers into improper fractions first:

3 1/1 = (3 * 1 + 1)/1 = 4/1

Now we can simplify the expression:

(2/7 + 4/1) * 4 2/3 = (2/7 + 4) * 4 2/3 = (2/7 + 28/7) * 4 2/3 = (30/7) * 4 2/3

Next, let's convert the mixed number 4 2/3 into an improper fraction:

4 2/3 = (4 * 3 + 2)/3 = 14/3

Now we can continue simplifying the expression:

(30/7) * 14/3 = (30 * 14)/(7 * 3) = 420/21 = 20

Therefore, the value of the expression is 20.

2. (4 1/5 - 2 3/4) * 2 2/19:

Let's convert the mixed numbers into improper fractions:

4 1/5 = (4 * 5 + 1)/5 = 21/5 2 3/4 = (2 * 4 + 3)/4 = 11/4

Now we can simplify the expression:

(21/5 - 11/4) * 2 2/19 = (84/20 - 55/20) * 2 2/19 = (29/20) * 2 2/19

Next, let's convert the mixed number 2 2/19 into an improper fraction:

2 2/19 = (2 * 19 + 2)/19 = 40/19

Now we can continue simplifying the expression:

(29/20) * 40/19 = (29 * 40)/(20 * 19) = 1160/380 = 29/19

Therefore, the value of the expression is 29/19.

Please provide the missing parts of the expressions (e.g., the numbers after the minus sign) in question 4 so that I can help you solve it.