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過點(1,1)向x軸、y軸作垂線段,連同曲線xy=1將正方形分成四個區域,分別積分即可. 原式=∫[0,1]∫[0,1]dydx+∫[1,2]∫[0,1/x]dydx+∫[1,2]∫[0,1/y]dxdy+∫[1/2,2]∫[1/x,2]xydydx
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