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答案：
D
正方形的边
长，四舍五入到厘米，为6厘米。问这个正方形区域面积的最小值为多少？
四舍五入到厘米为6厘米，那么正方形的边长的取值范围为[5.5,6.5）
所以最小值为5.5*5.5=30.25 
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