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【OG20-P147-6题】
In the figure above ,what are the coordinates of point R?
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分析B选项
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分析E选项
我有更好的解析 
暂无雷哥网文字解析
△OSR是等腰直角三角形
R的横纵坐标的绝对值相等，都是5
所以R(5,-5)
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