问题
选择题
函数f(x)=sin(x-
|
答案
函数f(x)=sin(x-
)图象的对称轴方程：x-π 4
=kπ+π 4
，∴x=kπ+π 2
，k∈Z，k=-2时x=-3π 4
；π 4
所以函数的对称轴方程为：x=-
；π 4
故选D．
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函数f(x)=sin(x-
|
函数f(x)=sin(x-
)图象的对称轴方程：x-π 4
=kπ+π 4
，∴x=kπ+π 2
，k∈Z，k=-2时x=-3π 4
；π 4
所以函数的对称轴方程为：x=-
；π 4
故选D．
| 根据句意从方框中选用合适的词组,并用其适当形式填空。 | |
2. These houses are very old. We should _________ them _____________ to build new ones. 3. I found a wallet lying on the ground. I quickly ________ it ___________ and handed it to the teacher. 4. The walls ___________ old glass bottles that are glued together. 5. ____________! It's dangerous for you little kids to run about on the busy street. |