Mathematics
Senior High
横向きで見にくいかもしれないですけど、わかる方解説お願いします
[1 3区の2次不等式の解が全て の実数であるような 定数の値の範囲を求めよ。
(1) 2z2一 zz十十1>0 _ ②⑫ ゲー(&十3)z二4テ0
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