9. feladat megoldása
(+ | 3) |
|
(– | 8) | = | + | 3 | + | 8 | = | + | 1 | 1 | ||
(+ | 4) |
|
(+ | 2) | = | + | 4 | + | 2 | = | + | 6 | |||
(– | 5) |
|
(– | 2) | = | – | 5 | – | 2 | = | – | 7 | |||
(– | 3) |
|
(+ | 4) | = | – | 3 | – | 4 | = | – | 7 | |||
(+ | 6) |
|
(+ | 3) | = | + | 6 | + | 3 | = | + | 9 |