设f(x)为连续函数,证明∫0ax3f(x2)dx=∫0a2fx(x)dx (a>0).

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问题 设f(x)为连续函数,证明∫0ax3f(x2)dx=0a2fx(x)dx   (a>0).

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答案0ax3f(x2)dx=[*]∫0ax2f(x2)dx2 [*]∫0a2tf(t)dt=[*]∫0a2xf(x)dx.

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