急 设A1=2,A2=4,数列BN满足:Bn=A(n+1)-An,B(n+1)=2Bn+21 求证书写BN+2是等比数列(我已证了)2求数列An的通项公式
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![急 设A1=2,A2=4,数列BN满足:Bn=A(n+1)-An,B(n+1)=2Bn+21 求证书写BN+2是等比数列(我已证了)2求数列An的通项公式](/uploads/image/z/6962297-41-7.jpg?t=%E6%80%A5+%E8%AE%BEA1%3D2%2CA2%3D4%2C%E6%95%B0%E5%88%97BN%E6%BB%A1%E8%B6%B3%EF%BC%9ABn%3DA%28n%2B1%29-An%2CB%28n%2B1%29%3D2Bn%2B21+%E6%B1%82%E8%AF%81%E4%B9%A6%E5%86%99BN%2B2%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%88%E6%88%91%E5%B7%B2%E8%AF%81%E4%BA%86%EF%BC%892%E6%B1%82%E6%95%B0%E5%88%97An%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F)
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