【简答题】在数列{a n }中,如果对任意的n∈N * ,都有 a n+2 a n+1 - a n+1 a n =λ (λ为常数),则称数列{a n }为比等差数列,λ称为比公差.现给出以下命题: ①若数列{F n }满足F 1 =1,F 2 =1,F n =F n-1 +F n-2 (n≥3),则该数列不是比等差数列; ②若数列{a n }满足 a n =(n-1)? 2 n-1 ,则数列{a n }是比...
【简答题】Complete the following table according to the passage. About Häagen-Dazs Details First retail store [1] Creators of Häagen-Dazs [2] First flavors of Häagen-Dazs [3] Other flavors of Häagen-Dazs [4] Me...