设f(u)连续,则∫0xdu∫u1vf(u2-v2)=______.

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问题 设f(u)连续,则0xdu∫u1vf(u2-v2)=______.

选项

答案-xf(x2-1)

解析uxf(u2-v2)dv=
u1f(u2-v2)d(u2-v2)=
0u2-1f(t)dt,

0xdu∫u1vf(u2-v2)=0xdu∫0u2-1f(t)dt=0x2-1f(t)dt,
0xduvf(u2-v2)du=-xf(x2-1).
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