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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】2013年安徽高考15题
算柱 (兩位數)
兩位數除以一位數（一）
三位數除以一位數（一）
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第三冊2-2習題12
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