设f(x)连续,则∫0x(∫0tf(x)dx)dt=( ).

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问题 设f(x)连续,则∫0x(∫0tf(x)dx)dt=(     ).

选项 A、∫0xf(t)(t一x) dt
B、∫0tf(x)(x一t) dx
C、∫0xf(t)(x一t)dt
D、∫0tf(t)(t一x)dx

答案C

解析 利用分部积分法求之.
0x(∫0xf (x)dx)dt一[t∫0xf(x)dx]0x一∫0xtd(∫0tf(x)dx)
=x∫0xf(t) dt一∫0xtf(t)dt一∫0xf(t)(x一t)dt
因而仅(C)入选.
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