【简答题】设数列 前 项和为 , 满足 . (1)求数列 的通项公式; (2)令 求数列 的前 项和 ; (3)若不等式 对任意的 恒成立,求实数 的取值范围.
【简答题】函数 . (1)求 的解析式; (2)求证:函数 为奇函数; (3)若实数 满足: , 求 的取值范围
【单选题】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...
A.
is a part of a comedy film
C.
is something real and becoming common daily
【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】已知不等式 . (1)若对 不等式恒成立,求实数 的取值范围; (2)若对 不等式恒成立,求实数 的取值范围; (3)若对满足 的一切m的值不等式恒成立,求实数 的取值范围.
【简答题】已知定义在 上的函数 是偶函数,且 时, . (1)当 时,求 解析式; (2)当 ,求 取值的集合. (3)当 ,函数的值域为 ,求 满足的条件。
【单选题】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...
A.
is a part of a comedy film
C.
is something real and becoming common daily
【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 > ...