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If x^2 + x + k > 0 for any real value of x, what is k?
Author:
johnmayhk
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
畫出對稱圖形
第八周作业
兩位數加法
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我的测试
梯形
圓與圓柱
Compare areas by cutting shapes Q1
Copy of 分數與小數
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Numbers
Similar Triangles
Geometric Distribution
Arithmetic Mean
Geometric Mean