Question

1) - 5 2/ 7+ (- 4 3/7 ); 2) -3,8 + ( -4 ) + ( - 1,2 ); 3) 8/15 + ( - 19/20 );

Answer 1

Решение смотри на фото

Answer 2

Let's solve each of the expressions:

1. To add the numbers -5 2/7 and -4 3/7, we need to find a common denominator. In this case, the denominator is 7. Converting both numbers to have a denominator of 7:

-5 2/7 = -5 * 7/7 + 2/7 = -35/7 + 2/7 = -33/7 -4 3/7 = -4 * 7/7 + 3/7 = -28/7 + 3/7 = -25/7

Now, we can add the fractions:

-33/7 + (-25/7) = (-33 - 25)/7 = -58/7

Therefore, the sum of -5 2/7 and -4 3/7 is -58/7.

2. To add -3.8, -4, and -1.2, we simply add the numbers:

-3.8 + (-4) + (-1.2) = -3.8 - 4 - 1.2 = -9 - 1.2 = -10.2

Therefore, the sum of -3.8, -4, and -1.2 is -10.2.

3. To add 8/15 and -19/20, we need to find a common denominator. The least common multiple of 15 and 20 is 60. Converting both fractions to have a denominator of 60:

8/15 = (8 * 4)/(15 * 4) = 32/60 -19/20 = (-19 * 3)/(20 * 3) = -57/60

Now, we can add the fractions:

32/60 + (-57/60) = (32 - 57)/60 = -25/60

Simplifying the fraction:

-25/60 = -5/12

Therefore, the sum of 8/15 and -19/20 is -5/12.