过原点作曲线y=ex有切线,则切点的坐标为__________________,切线的斜率为__________. 答案:(1,e) e解析:设切点坐标为(x0,y0),∵y′=ex,∴切线斜率为k=.又∵切线过原点,∴切线方程为y=x.又∵切点同时在切线和曲线上,∴∴切点为(1,e),切线斜率为e.
At first he hated the new job but decided to give himself a few months to see ________ It got any better.
[ ]
A.when
B.how
C.why
D.if