设数列{an}{bn}满足a1=b1=6 a2=b2=4 a3=b3=3若{an+1 - an}为等差数列.{bn+1 -bn}为等比数列.分别求{an}{bn}的通项公式.
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![设数列{an}{bn}满足a1=b1=6 a2=b2=4 a3=b3=3若{an+1 - an}为等差数列.{bn+1 -bn}为等比数列.分别求{an}{bn}的通项公式.](/uploads/image/z/4522204-28-4.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%7Ban%7D%7Bbn%7D%E6%BB%A1%E8%B6%B3a1%3Db1%3D6+a2%3Db2%3D4+a3%3Db3%3D3%E8%8B%A5%7Ban%2B1+-+an%7D%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97.%7Bbn%2B1+-bn%7D%E4%B8%BA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97.%E5%88%86%E5%88%AB%E6%B1%82%7Ban%7D%7Bbn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F.)
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