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题意是这个样子的题目大意：题目大意：已知一个圆心为（0，0），半径随时间增长的位于X轴上方的半圆，初始面积为0，每年的面积增加50，给出一个坐标，求该坐标在第几年被该半圆覆盖。 Followed by: Post your reply here: |
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