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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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異分母分數減法
【案例】圆柱体内放置一个大球六个小球
柱體建築師
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
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trigonometry3
三節棍
Copy of Mjerenje obujma 3
Rotation of line
我的第一个GGB绘本
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Incircle or Inscribed Circle
Cosine
Isosceles Triangles
Trapezoid
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