Question

计算(2^n+4-2*2^n)/(2*2^n-3)快!1

Answer 1

原式=[2^(n+4)-2^(n+1)]/[2^(n-2)] =2^(n+4)/2^(n-2)-2^(n+1)/2^(n-2) =2^(n+4-n+2)-2(n+1-n+2) =2^6-2^3 =64-8 =56