A.x+y=π B.x-y=π-4 C.x-y=π D.x+y=π-4B

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问题

选项 A.x+y=πB.x-y=π-4C.x-y=πD.x+y=π-4

答案B

解析[img]/upload/tiku/212/2835521_1.jpg[/img][img]/upload/tiku/212/2835521_1_1.jpg[/img]
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