3^n+1-3^n
a) ________
2
b)2^n+2^n-1
____________
4^n+1
спс зарание!!!
3^n+1-3^n a) ________=3^n (3-1) 2 ________=3^n
b)2^n+2^n-1 ____________=2^-n(2^2n+1) 4^n+1 ___________= 2^-n(4^n+1)
4^n+1 __________= 1
4^n+1 ______
2^n