【简答题】对于正比例函数y=2x,当x=1时,函数值y=______.
【简答题】函数 y=tan( π 2 x) 的定义域是______(用集合表示).
【单选题】下列函数关系式:①y=-2x,② y=- 2 x ,③y=-2x 2 ,④y=2,⑤y=2x-1.其中是一次函数的是( )
【简答题】Naomi suggests that Hector _____________ (make time / write down) where and when he is going to study.
【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...
【简答题】函数y=2x的图象与函数y=x+1的图象的交点坐标是______.
【单选题】在下列函数(1)y=2x(2) y= x 2 (3) y=- 2 x (4)y=2x 2 中,函数值y随x的增大而增大的是( )
【单选题】Naomi suggests that Hector _____________ (make time / write down) where and when he is going to study.
【单选题】已知a>0且a≠1,下列四组函数中表示相等函数的是( )
A.
y=lo g a x与y=(lo g x a ) -1
D.
y=lo g a x 2 与y=2lo g a x
【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)