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