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culează:
a) (18 + 2 x 7): (12:2 +8:4)
b) 24 – 24:3x (72:9- 2 x 3): 4 x5
36:6+ 4x2 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)​