A <img width="80" height="33" src="https://www.beizhujiaoyu.com/uploads/202208/20211222221953_3497.jpg" title="" align="" alt="" /> B -dx-dy C <img width="70" height="35" src="https://www.beizhujiaoyu.com/uploads/202208/20211222221955_0841.jpg" title="" align="" alt="" /> D dx+dy E <img width="100" height="35" src="https://www.beizhujiaoyu.com/uploads/202208/20211222221955_5060.jpg" title="" align="" alt="" />

A (-3，3)为f(x，y)的极小值点 B (3，-3)为f(x，y)的极小值点 C (-3，3)为f(x，y)的极大值点 D (3，-3)为f(x，y)的极大值点 E f(x，y)没有极值点

A A^-1BA B A^-1B^-1A^-1 C AB^-1A^-1 D A^-1BA^-1 E ABA^-1

A 4组 B 2组 C 3组 D 1组 E 5组

A <img width="171" height="21" src="https://www.beizhujiaoyu.com/uploads/202208/20211222221959_3341.jpg" /> B <img width="159" height="21" src="https://www.beizhujiaoyu.com/uploads/202208/20211222221959_7520.jpg" /> C <img width="166" height="21" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222001_5539.jpg" /> D <img width="158" height="21" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222001_9279.jpg" /> E <img width="191" height="21" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222003_7091.jpg" />

A <img width="93" height="49" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222005_8497.jpg" /> B <img width="93" height="48" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222006_2248.jpg" /> C <img width="56" height="48" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222007_9591.jpg" /> D <img width="56" height="48" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222008_3185.jpg" /> E <img width="78" height="49" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222010_0697.jpg" />

A α₁-2α₂，α₂-2α₃，α₃-2α₁ B α₁-α₂，α₂-α₃，α₃-α₁ C α₁+2α₂，α₂+2α₃，α₃+2α₁ D α₁+α₂，α₂+α₃，α₃+α₁ E 2α₁+α₂，2α₂+α₃，2α₃+α₁

A 2和0 B 1和0 C 0和1 D 0和0 E 1和2

A a=3，b=-1 B a=-3，b=-1 C a=3，b=1 D a=2，b=-1 E a=-1，b=3

A <img width="18" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222014_6622.jpg" /> B <img width="18" height="37" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222014_9278.jpg" title="" align="" alt="" /> C <img width="18" height="37" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222016_8664.jpg" title="" align="" alt="" /> D <img width="18" height="37" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222017_5841.jpg" title="" align="" alt="" /> E <img width="18" height="37" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222019_1945.jpg" title="" align="" alt="" />