设D是由不等式 x + y ≤1所确定的有界区 A.0 B.1 C.2/3 D.1/3

作者: tihaiku 人气: - 评论: 0
问题 设D是由不等式 x + y ≤1所确定的有界区 A.0 B.1 C.2/3 D.1/3
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答案 C
解析 提示:画出积分区域D,关于x轴、y轴对称,且f(x,y)满足f(-x,y)=f(x,y),f(x,-y)=f(x,y),利用对称性只要计算出第一象限的二重积分,然后乘以4。

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