Question

Запиши сумму чисел без скобок и найди ответ. Что ты заметил? 1) (-1,9) + (-5,8) 2) (-8,7) + (+3,2) 3) (-2,1) + (-1,2) (-5,8) + (-1,9) (+3,2) + (-8,7) (-1,2) + (-2,1)

Answer 1

-1,9-5,8=-7,7       -8,7+3,2=-5,5                -2,1-1,2=-3,3
-5,8-1,9=-7,7        3,2-8,7=-5,5                  -1,2 -2,1=-3,3


 Что ты заметил? в столбиках одинаковые  ответы

Answer 2

To calculate the sum of the numbers in each expression, let's add the numbers without parentheses:

1. (-1.9) + (-5.8) = -1.9 - 5.8 = -7.7
2. (-8.7) + (+3.2) = -8.7 + 3.2 = -5.5
3. (-2.1) + (-1.2) = -2.1 - 1.2 = -3.3 (-5.8) + (-1.9) + (+3.2) + (-8.7) + (-1.2) + (-2.1) = -5.8 - 1.9 + 3.2 - 8.7 - 1.2 - 2.1 = -16.5

Now, let's see what I noticed:

In expressions 1), 2), and 3), the sum of numbers without parentheses is calculated correctly and doesn't need any further processing.

However, the last expression seems to be a combination of the previous three expressions, separated by spaces. To find the total sum, we need to add all the individual results together:

-7.7 + (-5.5) + (-3.3) = -16.5

So, the answer to the last expression is also -16.5.