A. 2x+2y B. x+y C. 2x-2y D. x-yB

shuhaiku2019-12-17 10

问题

选项 A. 2x+2yB. x+yC. 2x-2yD. x-y

答案B

解析[img]/upload/tiku/233/2658610_1.jpg[/img]

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