2+2 6+6 5+5 4+4 9+9 1+1+8 5+4 6+9

Вычислим значение выражений:

1) 2 + 2 = 2 * (1 + 1) = 2 * 2 = 4;

2)  6 + 6 = 6 * (1 + 1) = 2 * 6 = 12;

3)  5 + 5 = 5 * (1 + 1) = 5 * 2 = 10;

4) 4 + 4 = 4 * (1 + 1) = 4 * 2 = 8;

5) 9 + 9 = 9 * (1 + 1) = 9 * 2 = 18;

6) 1 + 1  + 8 = 2 + 8 = 10; 

7) 5 + 4 = 9;

8) 6 + 9 = 5 + 10 = 15.