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

昕玥2019-12-17 57

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

选项

答案D

解析[img]/upload/tiku/190/2457245_1.jpg[/img]

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