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教学素材：正余弦函数及其反函数
Author:
清风拂琴，陌上花开
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第八周作业2
百分數及其應用
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异形操场
双心四边形
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冪函數
[問題] 點 (4,7) 到 3x+4y = 0 的距離為何？
皓晴是智障
線性規劃
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