函数y=2x在[0,1]上的最大值与最小值之和为______.
函数y=2x在[0,1]上是增函数,
所以最大值为2,最小值为1,
它们之和为3,
故答案为3.
You had better save your time ________.[ ]
A. for a day
B. all day
C. in the day
D. in a day
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