知识点归纳总结等差数列

知识点归纳总结1.等差数列通项公式求和公式a* =a<! +(n _i)d =am +(n _m)d_n 佝+弘)_S naDn _(1)若+n(n-1)d2 2_ l心1 7m,n, p,q w N