交换积分次序,则累次积分∫-10dy∫21-yf(x,y)dx=( ).

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问题 交换积分次序,则累次积分∫-10dy∫21-yf(x,y)dx=(          ).

选项 A、∫12dx∫01-xf(x,y)dy
B、∫12dx∫1-x0f(x,y)dy
C、∫12dx∫01+xf(x,y)dy
D、∫12dx∫1+x0f(x,y)dy

答案A

解析-10dy∫21-yf(x,y)dx=-∫-10dy∫1-y2f(x,y)dx=-∫12dx∫1-x0f(x,y)dy=∫11dx∫01-xf(x,y)dy
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