a1=2/3,an=-2/3,n=14.求等差数列{an}的Sn
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a1=2/3,an=-2/3,n=14.求等差数列{an}的Sn
a1=2/3,an=-2/3,n=14.求等差数列{an}的Sn
a1=2/3,an=-2/3,n=14.求等差数列{an}的Sn
等差数列求和公式之二
Sn=n(a1+an)/2
代入数据,Sn=0
OK了
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a1=2/3,an=-2/3,n=14.求等差数列{an}的Sn
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