Question

№1a) 7/10 : 5б) 5/17 * 2 (семь десятых разделить на пять, пять семнадцатых умножить на 2)№2В столовую завезли картошку. За первую неделю в столовой израсходовали 3/20, а за вторую 2/5 всей картошки. Какая часть картошки осталась неизрасходованной.

Answer 1

a) 7/10 : 5 =7/10 * 1/5 = 7/50

5/17 *2 =10/17 

Answer 2

Answer:

1a) To solve the expression 7/10 : 5, we need to divide 7/10 by 5.

Dividing fractions involves multiplying the first fraction by the reciprocal of the second fraction. The reciprocal of 5 is 1/5.

So, we have:

7/10 : 5 = 7/10 * 1/5

Multiplying the numerators (7 * 1) and the denominators (10 * 5), we get:

7/10 * 1/5 = 7/50

Therefore, the result of 7/10 : 5 is 7/50.

1b) To solve the expression 5/17 * 2, we need to multiply 5/17 by 2.

Multiplying fractions involves multiplying the numerators and the denominators.

So, we have:

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

Multiplying the numerators (5 * 2) and the denominators (17 * 1), we get:

10/17

Therefore, the result of 5/17 * 2 is 10/17.

2) In the cafeteria, they used 3/20 of the potatoes in the first week and 2/5 of the potatoes in the second week. We need to find the remaining fraction of potatoes.

To find the remaining fraction, we subtract the fractions used from 1 (whole).

So, we have:

1 - (3/20 + 2/5)

To add fractions, we need to find a common denominator. The least common multiple of 20 and 5 is 20.

Converting the fractions to have a common denominator of 20, we get:

1 - (3/20 + 8/20)

Adding the fractions, we get:

1 - 11/20

To subtract fractions, we need to have a common denominator. In this case, the common denominator is 20.

Subtracting the fractions, we get:

9/20

Therefore, the remaining fraction of potatoes that was not used is 9/20.