【单选题】下列函数:①y=2x;②y=x;③y=x -1 ;④y= ,其中反比例函数的个数是 [ ]
【简答题】函数 y=tan( π 2 x) 的定义域是______(用集合表示).
【简答题】由y=2x的图形作下列函数的图形: (1)y=3×2x (2)y=2x+4 (3)y=-2x (4)y=2-x
【判断题】情绪的社会性参照是婴儿情绪社会化的一种重要现象和过程,即在不确定的情境中借助他人表情作出推断,包含了婴儿对他人情绪表情的分辨和如何利用这些情绪信息来指导自己的行为。
【简答题】阅读理解。 Vince has a good friend Hector. Last Friday was Hector's birthday. It was five o'clock in the afternoon. Hector's brother said, 'The birthday party is beginning.' At that time, Vince appeared (出...
【单选题】Naomi suggests that Hector _____________ (make time / write down) where and when he is going to study.
【单选题】你觉得开展学风建设诊改活动,学生迟到、旷课等现象变化情况?
【简答题】给出下列函数:①y=2x;②y=-2x+1;③ y= 2 x (x>0) ;④y=x 2 (x<-1),其中y随x的增大而减小的函数是______.(将正确的序号填入横格内)