Question

2^n + 2^n-1 / 2 ^n+1 - 2 ^n

Answer 1

=2^n+2^(n-1)/2^(n+1)-2^n
=2^n-2^n+2^(n-1)×2^-(n+1)
=0+2^(n-1-n-1). (a^m×m^n=a^(m+n)
=2^-2
=1/2^2
=1/4

Answer 2

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