若实数x,y满足(x+y)(x+y-3)+2=0,则x+y的值为()A.-1或-2B.-1或2C.1或-2D.1或2-数学

题目简介

若实数x,y满足(x+y)(x+y-3)+2=0,则x+y的值为()A.-1或-2B.-1或2C.1或-2D.1或2-数学

题目详情

若实数x,y满足(x+y)(x+y-3)+2=0,则x+y的值为(  )
A.-1或-2B.-1或2C.1或-2D.1或2
题型:单选题难度:偏易来源:不详

答案

(x+y)(x+y-3)+2=0,
(x+y)2-3(x+y)+2=0,
(x+y-2)(x+y-1)=0,
x+y-2=0,x+y-1=0,
x+y=2,x+y=1,
故选D.

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