Mathematics
Senior High
こういった問題で、＞の向きだったらx<a、a<x
<の向きだったらa<x<aとなる理由ってなんですか？
どうしても理屈が理解できなくて…💦
解説お願いします🙇♂️
3 P107 練習33 次の2次不等式を解け。
(2)(x+2Xx-5)<0
(4) x?-xー220
(5) x?+5x+6>0
(6) x?<9
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