a) 7 - (-3) = 7 + 3 = 10
b) 5 * 0.1 + 12/2 = 0.5 + 6 = 6.5
c) 3√36 * 6 = 3√216 = 6
d) √(3*3) = 3
e) 4 + 3 = 7
f) 20 : 2 = 10
