设,则y′(2)=(  )。A.1 B.1/2 C.1/3 D.1/4

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问题,则y′(2)=(  )。A.1B.1/2C.1/3D.1/4

选项 A.1
B.1/2
C.1/3
D.1/4

答案 C

解析
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