Mathematics
Senior High
この問題の途中経過を教えてください。
なぜ答えが
a＜−√2/2, √2/2＜a
になるんですか？
3次方程式ー3a'x+a=0が異なる3個の実数解をもつように,定数a
のとり得る値の範囲を定めよ。
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