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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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【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
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【案例】2018年全国1卷理科12题
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