二次积分 https://assets.asklib.com/psource/2015102917004746434.jpg 交换积分次序后的二次积分是()。
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将 https://assets.asklib.com/psource/2015102917075243985.jpg (其中D:x2+y2≤1)转化为极坐标系下的二次积分,其形式为()。
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D域由x轴,x2+y2-2x=0(y≥0)及x+y=2所围成,f(x,y)是连续函数,转化 https://assets.asklib.com/psource/2015102917113774223.jpg 为二次积分为()。
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