设f(x)连续,且,则f(7)=(  )。A.1/4 B.1/12 C.1/

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问题 设f(x)连续,且,则f(7)=(  )。A.1/4B.1/12C.1/3D.1/7

选项 A.1/4
B.1/12
C.1/3
D.1/7

答案 D

解析
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