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数学
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GRE数学题2
r is the radius and d is the diameter of circular region C.求the area of C与r-d比较大小
求算法与解答
人气：269 ℃ 时间：2020-04-15 06:11:01
解答
由题意,d=2r,Area=πr^2
面积是正的,r半径是直径d的一半,r-d小于零,
所以the area of C 一定比 r-d 大咯
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