//等差数列
//an = a1+ (n-1)*p;
//sn = n*(a1+an)/2;
//等比数列
//an = a1*pow(q,n-1)
//sn = a1*(1-pow(q,n) )/(1-q)
等差等比数列
//等差数列
//an = a1+ (n-1)*p;
//sn = n*(a1+an)/2;
//等比数列
//an = a1*pow(q,n-1)
//sn = a1*(1-pow(q,n) )/(1-q)
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转载自blog.csdn.net/wulong710/article/details/80314515
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