Question

-7,5+4,2. -4,7+2,9. -7/9+5/6 -3,7-5,8. 3,7-5,6. -2 1/8- 1 5/16

Answer 1

-7,5+4,2 = -3,3

-4,7+2,9 = -1,8

-7/9+5/6 = -14+15/18 = 1/18

-3,7-5,8 = -95

3,7-5,6 = -1,9

-2 1/8- 1 5/16 = -1/4-5/16 = -9/16

Answer 2

Let's solve each of the given expressions step by step:

1. -7.5 + 4.2 = -3.3

2. -4.7 + 2.9 = -1.8

3. -7/9 + 5/6 To add these fractions, we need to find a common denominator, which is the least common multiple (LCM) of 9 and 6, which is 18. -7/9 can be written as (-7 * 2)/(9 * 2) = -14/18 5/6 can be written as (5 * 3)/(6 * 3) = 15/18 Now, we can add the fractions: (-14/18) + (15/18) = 1/18

4. -3.7 - 5.8 = -9.5

5. 3.7 - 5.6 = -1.9

6. -2 1/8 - 1 5/16 To subtract these mixed numbers, we need to first convert them to improper fractions. -2 1/8 can be written as (-2 * 8 + 1)/8 = (-17)/8 -1 5/16 can be written as (-1 * 16 + 5)/16 = (-11)/16 Now, we can subtract the fractions: (-17/8) - (-11/16) To subtract fractions, we need a common denominator, which is 16. (-17/8) can be written as (-17 * 2)/(8 * 2) = (-34)/16 (-11/16) remains the same. Now, we can subtract the fractions: (-34/16) - (-11/16) = (-34 + 11)/16 = (-23)/16

So, the results of the expressions are:

1. -7.5 + 4.2 = -3.3
2. -4.7 + 2.9 = -1.8
3. -7/9 + 5/6 = 1/18
4. -3.7 - 5.8 = -9.5
5. 3.7 - 5.6 = -1.9
6. -2 1/8 - 1 5/16 = -23/16 (or -1 7/16 in mixed number form)