∫0t2dxf(x,y)dy(t>0).

admin2019-07-22  5

问题0t2dxf(x,y)dy(t>0).

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答案如图8.13所示.当z∈[0,t2]时,[*]≤t(t>0),于是 原式=-∫0t2[*]-∫0tdy0y2f(x,y)dx =∫0tdy∫y20f(x,y)dx. [*]

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