题目内容：
若x,y∈R+，且x+y=1，则x2+y2的最小值是 ( ) 
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答案解析：
单选题：若x,y∈R+，且x+y=1，则x2+y2的最小值是 ( )
- 题目分类：文科数学
- 题目类型：单选题
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