设D是矩形区域:0≤x≤π/4,-1≤y≤1, A. 0 B.-1/2 C.1

练习题库2022-08-02  42

问题 设D是矩形区域:0≤x≤π/4,-1≤y≤1,A. 0 B.-1/2 C.1/2 D.1/4

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答案 D

解析
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