Sam, an unemployed piano tuner, said it was only the second thing he had ever won in his life. The first thing was an Afghan blanket at a church raffle （抽奖）when he was 25 years old. But this w
You can find all kinds information in just 76. __________a few minute on the Internet. It’s like going to a 77. __________huge library without have to walk around to find78. __________your books. Re
(a∈R)，是否存在实数a使函数f(x)为奇函数？若存在求出a的值，若不存在请说明理由．
∴a＝1.