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The second round review of senior high school mathematics
Sn= 1/2+4/4+…+n^2/2^n

Sn/2= 1/4+...+(n- 1)^2/2^n+n^2/2^(n+ 1)

Subtract Sn/2 =1/2+3/4+5/8+…+(2n-1)/2n+N2/2 (n+1).

Serial number/4 =1/4+3/8++(2n-3)/2 n++(2n-1)/2 (n+1)+n 2/2 (n+2)

Subtract Sn/4=

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