搞半天没懂在等差数列{An}中,n为奇数时S奇-S偶=a1+(n-1)d/2=An+1/2为什么?Sn=n乘A(n+1/2)为什么?S奇/S偶=n+1/n-1为什么?注:因为打不来下标,An表示数列,a1表示第一项,还有A(n+1/2)中n+1/2是下标S奇 意为在{An
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![搞半天没懂在等差数列{An}中,n为奇数时S奇-S偶=a1+(n-1)d/2=An+1/2为什么?Sn=n乘A(n+1/2)为什么?S奇/S偶=n+1/n-1为什么?注:因为打不来下标,An表示数列,a1表示第一项,还有A(n+1/2)中n+1/2是下标S奇 意为在{An](/uploads/image/z/1711625-41-5.jpg?t=%E6%90%9E%E5%8D%8A%E5%A4%A9%E6%B2%A1%E6%87%82%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7BAn%7D%E4%B8%AD%2Cn%E4%B8%BA%E5%A5%87%E6%95%B0%E6%97%B6S%E5%A5%87-S%E5%81%B6%3Da1%2B%28n-1%29d%2F2%3DAn%2B1%2F2%E4%B8%BA%E4%BB%80%E4%B9%88%3FSn%3Dn%E4%B9%98A%28n%2B1%2F2%29%E4%B8%BA%E4%BB%80%E4%B9%88%3FS%E5%A5%87%2FS%E5%81%B6%3Dn%2B1%2Fn-1%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E6%B3%A8%EF%BC%9A%E5%9B%A0%E4%B8%BA%E6%89%93%E4%B8%8D%E6%9D%A5%E4%B8%8B%E6%A0%87%2CAn%E8%A1%A8%E7%A4%BA%E6%95%B0%E5%88%97%2Ca1%E8%A1%A8%E7%A4%BA%E7%AC%AC%E4%B8%80%E9%A1%B9%2C%E8%BF%98%E6%9C%89A%28n%2B1%2F2%29%E4%B8%ADn%2B1%2F2%E6%98%AF%E4%B8%8B%E6%A0%87S%E5%A5%87+%E6%84%8F%E4%B8%BA%E5%9C%A8%7BAn)
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