1.
a) | 7 | + | -3 | = 7 + 3 = 10
b) | 7 | + | -9 | = 7 + 9 = 16
2.
a) x + y = - 2 + 5 = 3
b) x - y = -2 - ( + 5 ) = - 2 - 5 = -7
c) | x | + | y | = | -2 | + | + 5 | = 2 + 5 = 7
d) | x + y | = | -2 + 5 | = 3
3.
( - 5 - 2 ) - ( -7 + 5 ) = - 7 - ( -2 ) = - 7 + 2 = -5
| - 5 - 2 | + | - 7 + 4 | = | -7 | + | -3 | = 7 + 3 = 10
4.
| 8 - ( -5 ) | - ( -5 ) - 6 | = | 8 + 5 | - | - 11 | = 13 - 11 = 2