已知数列{an}满足2a(n+1)=a(n)+a(n-1)(n是正整数),
1个回答
{an}满足2a(n+1)=a(n)+a(n+2)(n是正整数),
应为等差
a=-10,b=2,
数列:-10,-8,-6,-4,-2,0,2,4,6,8
当n=5或n=6时前n项和的最小值-30
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