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x的範圍是0到4, 而y的範圍是x到2√x 畫出積分範圍, 那麼換成先對x積分的話, x的範圍就是0.25y²;到y, 而y的範圍是0到4, 所以交換積分次序得到 原積分 =∫(4.0)dy∫(y,0.25y²;)f(x,y)dx
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