A -2 B -1/2 C 0 D 1/2 E 2

A a=7，b=4 B a=10，b=-7 C a=4，b=7 D a=10，b=6 E a=2，b=3

A 2 B 1 C 1/2 D 0 E -1

A 14 B 16 C 7/2 D 56/9 E 64/9

A -1 B 1 C ln3 D -ln3 E 0

A 0 B 2dx C 3dx D 4dx E 6dx

A cos1-sin1 B sin1-cos1 C cos1+sin1 D 1+cos1-sin1 E 1+sin1-cos1

A x+y=1 B x+y=-1 C x-y=1 D x-y=-1 E 2x+y=1

A 最大值是6e^-3 B 最小值是-2e C 递减区间是(-∞，0) D 递增区间是(0,+∞) E 凹区间是(0,+∞)

A e B <img src="https://www.beizhujiaoyu.com/uploads/202208/164670220475601.jpg" alt="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164670224697101.jpg" alt="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164670228941491.jpg" alt="" /> E <img src="https://www.beizhujiaoyu.com/uploads/202208/16467023571881.jpg" alt="" />