【简答题】已知函数 f(x)=1+ 2 x ,数列{x n }满足x 1 = 11 7 ,x n+1 =f(x n );若b n = 1 x n -2 + 1 3 . (1)求证数列{b n }是等比数列,并求其通项公式; (2)若c n =3 n -λb n (λ为非零整数,n∈N*),试确定λ的值,使得对任意n∈N*,都有c n+1 >c n 成立.
【简答题】Fill in the blanks by using appropriate words in the text, the first letter in each blank was given to help you. 1. Immediately the 1) r_____ d lawyer Clarence Darrow offered his services to defend m...
【简答题】已知数列{x n }满足x 1 =x 2 =1并且 x n+1 x n =λ x n x n-1 ,(λ 为非零参数,n=2,3,4,…). (1)若x 1 、x 3 、x 5 成等比数列,求参数λ的值; (2)设0<λ<1,常数k∈N * 且k≥3,证明 x 1+k x 1 + x 2+k x 2 +…+ x n+k x n < λ k 1- λ k (n∈ N * ).
【简答题】______ s Modern Painters was written to defend J. M. W. Turner, the English landscape painter, against the attacks on his painting made by the conventional critics of the day.
【简答题】John Ruskin s______was written to defend J. M. W. Turner, the English landscape painter, against the attacks on his paintings made by the conventional critics of the day.