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

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  45
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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