I'm feeling terrible!I have a bad cold.
_______.You'd better see a doctor at once.( )
I'm afraid not
Sorry to hear that
Sounds great
You are right.
已知全集,,,则()
已知,对,使得,则的最小值为()
如图,正五边形的边长为2,甲同学在中用余弦定理解得,乙同学在中解得,据此可得的值所在区间为( )
定义在R上的奇函数,当时,,则关于的函数的所有零点之和为()
如图,平面内有三个向量,其中与的夹角为,与的夹角为,且,若,则()