高一数列题,有解析但有些地方不懂求解答.an=1/√n+√n+1=√n+1-√n,∴Sn=√n+1-1=10(这里开始不懂) ∴n=120填空题1 只给了个答案没过程.不知道有什么规律解析:(1)由(3-m)Sn+2man=m+3得(3-m)Sn+1+2man+1=m+3两
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![高一数列题,有解析但有些地方不懂求解答.an=1/√n+√n+1=√n+1-√n,∴Sn=√n+1-1=10(这里开始不懂) ∴n=120填空题1 只给了个答案没过程.不知道有什么规律解析:(1)由(3-m)Sn+2man=m+3得(3-m)Sn+1+2man+1=m+3两](/uploads/image/z/8105919-15-9.jpg?t=%E9%AB%98%E4%B8%80%E6%95%B0%E5%88%97%E9%A2%98%2C%E6%9C%89%E8%A7%A3%E6%9E%90%E4%BD%86%E6%9C%89%E4%BA%9B%E5%9C%B0%E6%96%B9%E4%B8%8D%E6%87%82%E6%B1%82%E8%A7%A3%E7%AD%94.an%3D1%2F%E2%88%9An%2B%E2%88%9An%2B1%3D%E2%88%9An%2B1-%E2%88%9An%2C%E2%88%B4Sn%3D%E2%88%9An%2B1-1%3D10%28%E8%BF%99%E9%87%8C%E5%BC%80%E5%A7%8B%E4%B8%8D%E6%87%82%29+%E2%88%B4n%3D120%E5%A1%AB%E7%A9%BA%E9%A2%981++%E5%8F%AA%E7%BB%99%E4%BA%86%E4%B8%AA%E7%AD%94%E6%A1%88%E6%B2%A1%E8%BF%87%E7%A8%8B.%E4%B8%8D%E7%9F%A5%E9%81%93%E6%9C%89%E4%BB%80%E4%B9%88%E8%A7%84%E5%BE%8B%E8%A7%A3%E6%9E%90%3A%281%29%E7%94%B1%283-m%29Sn%2B2man%3Dm%2B3%E5%BE%97%283-m%29Sn%2B1%2B2man%2B1%3Dm%2B3%E4%B8%A4)
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