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9. Calculează: a) |-4| + 5 + |-11|
b) |-27| - |- 13| +|16|
c) |-14| • |-2|- |-8|
d) |28| : |-14| + |8|
e) (|-2|)⁸ : (|2|)⁶ - (|-2|)²
f) (|5-2|)² : |-3| - |-3|​