【简答题】She was slim and he liked her that way. So he called a lawyer. The result was a contract. According to the document, the fresh-faced bride agreed to pay a fine for each pound she gained in weight, the...
【简答题】已知数列{a n }满足 a 1 =3, 2-2 a n+1 a n+1 -3 = a n (n∈ N * ),记 b n = a n -2 a n +1 . (Ⅰ)求数列{b n }的通项公式. (Ⅱ)若(4 n -1)a n ≥t?2 n+1 -17对任意n∈N * 恒成立,求实数t的取值范围; (Ⅲ)记 c n = 3 a n +1 ,求证: c 1 ? c 2 ? c 3 … c n > ...