数学当中的叠加法 由 an+1-an=3n(题目所给哦)得到:an - an-1 = 3(n-1) (由n-1>0得到n要大于等于2)an-1 - an-2 = 3(n-2)an-2 - an-3 = 3(n-3)...a3 - a2 = 3*2a2 - a1 = 3*1由叠加法(就是上面的所有式子相加,由上到
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![数学当中的叠加法 由 an+1-an=3n(题目所给哦)得到:an - an-1 = 3(n-1) (由n-1>0得到n要大于等于2)an-1 - an-2 = 3(n-2)an-2 - an-3 = 3(n-3)...a3 - a2 = 3*2a2 - a1 = 3*1由叠加法(就是上面的所有式子相加,由上到](/uploads/image/z/10204811-35-1.jpg?t=%E6%95%B0%E5%AD%A6%E5%BD%93%E4%B8%AD%E7%9A%84%E5%8F%A0%E5%8A%A0%E6%B3%95+%E7%94%B1+an%2B1-an%3D3n%28%E9%A2%98%E7%9B%AE%E6%89%80%E7%BB%99%E5%93%A6%29%E5%BE%97%E5%88%B0%EF%BC%9Aan+-+an-1+%3D+3%28n-1%29+%EF%BC%88%E7%94%B1n-1%3E0%E5%BE%97%E5%88%B0n%E8%A6%81%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E2%EF%BC%89an-1+-+an-2+%3D+3%28n-2%29an-2+-+an-3+%3D+3%28n-3%29...a3+-+a2+%3D+3%2A2a2+-+a1+%3D+3%2A1%E7%94%B1%E5%8F%A0%E5%8A%A0%E6%B3%95%EF%BC%88%E5%B0%B1%E6%98%AF%E4%B8%8A%E9%9D%A2%E7%9A%84%E6%89%80%E6%9C%89%E5%BC%8F%E5%AD%90%E7%9B%B8%E5%8A%A0%2C%E7%94%B1%E4%B8%8A%E5%88%B0)
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