1) 7+ (2•2•2) = 7 + 8 = 15
2) 9 • 3 = 27
3) 20 - (2•2•2•2) = 20 - 16 = 4
4) 2 • (6•6) = 2 • 36 = 72
5) 8 • (1/2•1/2) = 8 • 1/4 = 2
6) 1/3 • (3•3•3) = 1/3 • 27 = 9
7) [(1/5 • 5) • (1/5 • 5) • (1/5 • 5) • (1/5 • 5) • (1/5 • 5)] = 1 • 1 • 1 • 1 • 1 = 1
Or
7) (1/5 • 5)^5 = 1^5 = 1 • 1 • 1 • 1 • 1 = 1
I think these are right, exponents are just repeated multiplication. The first number let’s use 4 for example would be the base, and the second, smaller one lets say is 3 so you would have 4^3 that would mean you multiply 4 by itself three times
4•4•4 = 16•4 = 64
Hope that made sense good luck