Răspuns:
Ex 1:
a) 5³-2⁴ = 125-16 = 109
b) 123^0 -1^2012 = 1-1 = 0
c) 5²•2² = 25•4 = 100
d) (2+9)² = 11² = 11•11 = 121
Ex 6:
2³¹+2^30+2^39 = x•2^28
(2²+2+1)•2^29 = 2^28•x
(4+2+1)•2^29 = 2^28•x
7•2^29 = 2^28•x
2^28•x = 7•2^29
x = 7•2^29:2^28
x = 7•2
x = 14.
==EVERGREEN==