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

题库总管2019-12-17  6

问题

选项 A. 2x+2yB. x+yC.2x-2yD.x-y

答案B

解析[img]/upload/tiku/233/5183305_1.jpg[/img][img]/upload/tiku/233/5183305_1_1.jpg[/img]
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