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二次函数y=ax²(a<0)
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月如
GeoGebra
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【案例】2013年安徽高考15题
空间中两直线的位置关系
探究三角形的全等條件
祖冲之的期望:内棋与外棋
漂亮的摇摆曲线
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自製工具:「星星」
領結的角度
二次函數03
等弧對等角
Introduction to Rectangular Coordinates
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Fractions
Subtraction
Median Line
Confidence Interval
Means