Question

-20,5+(-7,5)+20 1/2+(-2,5)+6

Answer 1

$20 \frac{1}{2} = 20.5$
$- 20.5 - 7.5 + 20.5 - 2.5 + 6 = \\ = - 7.5 - 2.5 + 6 = - 10 + 6 = \\ = - 4$

Answer 2

=-20,5-7,5+10-2,5+6=-14,5

Answer 3

Let's solve the expression step by step:

1. -20 + 5: -20 + 5 = -15

2. -15 + (-7.5): To add two negative numbers, you simply add their absolute values and give the result a negative sign: |-15| + |-7.5| = 15 + 7.5 = 22.5 The result is -22.5

3. -22.5 + 20 1/2: To add a whole number and a mixed number, convert the whole number into a fraction with the same denominator as the mixed number. 20 1/2 = 20 + 1/2 = 20/1 + 1/2 = 40/2 + 1/2 = 41/2

   Now, add the fractions: -22.5 + 41/2 = To add a decimal and a fraction, convert the decimal to a fraction first. -22.5 = -22 5/10 = -22 1/2 (since 0.5 = 1/2)

   Now, add the fractions: -22 1/2 + 41/2 = (-22 + 41)/2 = 19/2

4. 19/2 + (-2.5): To add a fraction and a decimal, convert the fraction to a decimal first. 19/2 = 19 ÷ 2 = 9.5

   Now, add the decimals: 9.5 + (-2.5) = 7

5. 7 + 6: 7 + 6 = 13

So, the final result is 13.