There once was a little boy who wanted to meet the king. He set off, walking towards the king’s castle. After many years of walking, the king’s castle came into his view. However, as the boy dr
In order to improve English, . A.Jenny’s father bought her a lot of tapes B.Jenny bought a lot of tapes for herself C.a lot of tapes were bought by Jenny D.a lot of tapes wer
的函数
是奇函数. 
求
，
的值；
若对任意的
，不等式
恒成立，求
的取值范围.
.
.
.
.
.