Calculează:
a) (18+ 2 x 7): (12: 2 +8:4)
b) 24 - 24:3x (72:9- 2 x 3): 4 x 5
c) 36:6 + 4x2 * 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)​