Question

А) 2,9 + (-5,7) б) 3,2 + ( -11,8) в) 2/7 - 4/5 ​

Answer 1

Ответ:

Пошаговое объяснение:а) -2,8;б) -8,6;в)-18/35

Answer 2

а) 2,9+(-5,7)= -2,8

б)3,2+(-11,8)= - 8,6

в) 2/7-4/5= 4/5-2/7= - 18/35

Answer 3

Let's solve the given expressions:

а) 2.9 + (-5.7)

To add these numbers, simply add their numerical values:

2.9 + (-5.7) = -2.8

b) 3.2 + (-11.8)

Again, add the numerical values of the numbers:

3.2 + (-11.8) = -8.6

c) 2/7 - 4/5

To subtract fractions, find a common denominator for both fractions. The common denominator here is 35 (the least common multiple of 7 and 5). Then, convert both fractions to have the common denominator:

2/7 = 10/35 4/5 = 28/35

Now, you can subtract them:

2/7 - 4/5 = 10/35 - 28/35 = (10 - 28) / 35 = -18/35

So, the final result is -18/35.