Посчитать сумму:
3*1/2^2+5*(1/2^3+1/2^4)+7*(1/2^4+1/2^5+1/2^6)+...+(2n+1)(1/(2^(n+1))+1/2^(2+n)+...+1/2^(2n-1))
3*x^2+5*(x^3+x^4)+7*(x^4+x^5+x^6)+...+(2n+1)((x^(n+1))+x^(2+n)+...+x^(2n-1))
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