(9^n+1)/2为什么还是偶数?对不起,时间有点急,没把全题打出来:(7*3^(n-2)+1)/2+n*3^(n-2)还是偶数,n属于N*
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![(9^n+1)/2为什么还是偶数?对不起,时间有点急,没把全题打出来:(7*3^(n-2)+1)/2+n*3^(n-2)还是偶数,n属于N*](/uploads/image/z/6901111-55-1.jpg?t=%289%5En%2B1%29%2F2%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%98%E6%98%AF%E5%81%B6%E6%95%B0%3F%E5%AF%B9%E4%B8%8D%E8%B5%B7%EF%BC%8C%E6%97%B6%E9%97%B4%E6%9C%89%E7%82%B9%E6%80%A5%EF%BC%8C%E6%B2%A1%E6%8A%8A%E5%85%A8%E9%A2%98%E6%89%93%E5%87%BA%E6%9D%A5%EF%BC%9A%EF%BC%887%2A3%5E%EF%BC%88n-2%EF%BC%89%2B1%EF%BC%89%2F2%2Bn%2A3%5E%EF%BC%88n-2%EF%BC%89%E8%BF%98%E6%98%AF%E5%81%B6%E6%95%B0%EF%BC%8Cn%E5%B1%9E%E4%BA%8EN%2A)
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