Question

836. а)1/4+4/7+9/28 б) 1/5+3/10+7/20 в) 3/20+7/30+2 /40​

Answer 1

если неправильно то простите

а) 1/4 + 4/7 + 9/28 = 7/28 + 16/28 + 9/28 = 32/28 = 8/7 = 1  1/7

б) 1/5 + 3/10 + 7/20 = 4/20 + 6/20 + 7/20 = 17/20

в) 3/20 + 7/30 + 2/40 = 18/120 + 28/120 + 6/120 = 52/120 = 13/30

Answer 2

а) To add fractions, we need to find a common denominator. In this case, the common denominator is 28, which is the least common multiple of 4 and 7.

1/4 + 4/7 + 9/28

To make the denominators the same, we need to find equivalent fractions:

1/4 = 7/28 4/7 = 16/28 9/28 (already in the desired form)

Now we can add the fractions:

7/28 + 16/28 + 9/28 = (7 + 16 + 9)/28 = 32/28

However, we can simplify this fraction by dividing the numerator and denominator by their greatest common divisor, which is 4:

32/28 = (32/4)/(28/4) = 8/7

So, the result is 8/7.

б) Following the same process as in the previous question:

1/5 + 3/10 + 7/20

The least common multiple of 5, 10, and 20 is 20.

1/5 = 4/20 3/10 = 6/20 7/20 (already in the desired form)

Adding the fractions:

4/20 + 6/20 + 7/20 = (4 + 6 + 7)/20 = 17/20

The result is 17/20.

в) Again, we'll find a common denominator:

3/20 + 7/30 + 2/40

The least common multiple of 20, 30, and 40 is 120.

3/20 = 18/120 7/30 = 28/120 2/40 = 3/120

Adding the fractions:

18/120 + 28/120 + 3/120 = (18 + 28 + 3)/120 = 49/120

The result is 49/120.