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Calculează:
a) (18+ 2 x 7): (12: 2 +8:4)
b) 24 - 24:3 (72:9- 2 x 3): 4* 5
c) 36: 6 + 4 x 2 x 5 - (20-12:3)
d) 42:7 + (6 + 6) : 2 - 24: (5 + 3)
e) (25 + 20): 5-(19 + 5): 8
f) 10 + (10:10 + 10) - (10 x 1 + 10)​