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满足 sqrt(x^2 + y^2) = 5 的点 集合——什么图形?(答:以原点为圆心,半径为5的圆。)
满足 sqrt(x^2 + y^2) = 5 的点 集合——什么图形?(答:以原点为圆心,半径为5的圆。)
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