(x-y)2=()A.x2-y2B.x2-y2-2xyC.x2+y2D.x2+y2-2xy-数学

题目简介

(x-y)2=()A.x2-y2B.x2-y2-2xyC.x2+y2D.x2+y2-2xy-数学

题目详情

(x-y)2=(  )
A.x2-y2B.x2-y2-2xyC.x2+y2D.x2+y2-2xy
题型:单选题难度:中档来源:不详

答案

(x-y)2=x2-2xy+y2.
故选D.

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