Question

1 + 2 + 3 + 4 +5 = ?

Answer 1

$1 + 2 + 3 + 4 + 5 = \\ 3 + 3 + 4 + 5 \\ 6 + 4 + 5 \\ 10 + 5 \\ \bf = 15$

Answer 2

Ответ:

1 + 2 + 3 + 4 + 5 = ?

1+2=3

3+3=6

6+4=10

10+5=15

значит: 1 + 2 + 3 + 4 + 5 = 15