Question

1) -3,8 - 5,7 2) -8,4 + 3,7 3) 3,9 - 8,4 4) -2,9 + 7,3 5) - 2/9 + 5/6 6) - 1 3/4 - 2 1/12

Answer 1

1. -9.5

2. -4.7

3. -4.8

4. 4.4

5. 11/18

6. -3 5/6

Answer 2

Let's solve each of these calculations step by step:

1. -3,8 - 5,7 = (-3) - (-5) + (8 - 7) = -3 + 5 + 1 = 3 + 1 = 4

2. -8,4 + 3,7 = (-8) - (-3) + (4 - 7) = -8 + 3 - 3 = -5 - 3 = -8

3. 3,9 - 8,4 = 3 - 8 + (9 - 4) = -5 + 5 = 0

4. -2,9 + 7,3 = (-2) - 7 + (9 - 3) = -2 - 7 + 6 = -9 + 6 = -3

5. -2/9 + 5/6 To add or subtract fractions, we need a common denominator. The common denominator here is 18.

   = (-4/18) + (15/18) = -4/18 + 15/18 = (15 - 4)/18 = 11/18

6. -1 3/4 - 2 1/12 To subtract mixed numbers, you can either convert them to improper fractions or use borrowing. Here, I'll use borrowing:

   = (-1 - 2) + (3/4 - 1/12) = -3 + (9/12 - 1/12) = -3 + 8/12 = -3 + 2/3

So, the result is -3 + 2/3. If you want to express it as a mixed number:

= -2 1/3