12北语高数,求答案(3)

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12北语高数,求答案(3)
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12北语高数,求答案(3)
12北语高数,求答案(3)




12北语高数,求答案(3)
1)B,2)D,3)D,4)向下凹,但不具单调性.5)D
 
4)图