题目

 Those flowers were ___________ for your mother on her seventieth birthday, but as she is away, I would be glad if you accept them.   A. devoted                B. produced           C. meant               D. supplied 答案：C函数f(x)＝的定义域为R，且f(－n)＝0(n∈N)． (1)求证：a＞0，b＜0； (2)(文)若f(1)＝且f(0)＝，求证：f(1)＋f(2)＋…＋f(n)＞n＋－(n∈N)． (理)若f(1)＝，且f(x)在［0，1]上的最小值为，求证：f(1)＋f(2)＋…＋f(n)＞n＋－(n∈N)．