简答题:(本题满分l0分)
设函数f(x)=ax³+bx²+cx在x=2处取得极值，点(1，-1)为曲线y=f(x)的拐点，求
a，b，c．

A -e² B -e C e D e²

A <img width="98" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181850_0882.jpg" /> B <img width="75" height="45" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181852_0268.jpg" /> C <img width="78" height="39" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181852_1819.jpg" /> D <img width="56" height="39" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181854_1205.jpg" />

A 3 B 2 C 1 D 0

A 0 B ex C 2+ex D 6+ex

A arctanx B arccotx C <img width="56" height="39" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181856_1976.jpg" /> D 0

A <img width="108" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181858_2756.jpg" /> B <img width="130" height="37" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181858_4476.jpg" /> C <img width="110" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181900_4007.jpg" /> D <img width="133" height="37" src="https://www.beizhujiaoyu.com/uploads/202208/20210105181900_5268.jpg" />

A -10 B -8 C 8 D 10

A (x—y)¹⁰ B -(x—y)¹⁰ C 10(x—y)⁹ D -10(x-y)⁹

A (0，0) B (-1，1) C (1，1) D (1，-1)

A 0．1 B 0．2 C 0．3 D 0．4