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b)3•7 puterea 2 - 4 puterea 2
c) 3•4 puterea 3+ 2•9 puterea 2
d) (3 puterea 3-6):21
e) (13 puterea 2-11 puterea 2):1 puterea 20
f) 5 puterea 1 • (13 puterea 2+ 4 puterea 3)​