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举一反三
【单选题】设函数 有一阶偏导数,且点 是该函数的极小值点,则:
A.
P一定是该函数的最小值点
B.
P处的函数值一定小于0
C.
该函数一定有极大值点
D.
P一定是该函数的驻点
【简答题】Lots of people have hobbies. Some people collect old coins or foreign stamps; some do needlework; others spend most of their spare time on a particular sport. A lot of people enjoy reading. But readin...
【简答题】(Para. 2&4) In what way is much communal i n a hutong ? Households share a single (1)__________, (2) __________ share a public (3) __________ , and people spend lots of time (4) __________ around with...
【简答题】设 是 函数的两个极值点. （1）试确定常数 和 的值； （2）试判断 是函数 的极大值点还是极小值点，并求出相应极值.
【简答题】Please complete the summary of the whole text. It is said that in the US there are only three . They refer to , and season. Besides the three sports, Americans enjoy playing a variety of other sports....
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