Mathematics
Senior High
計算の手順はわかりますが、その後の解答の出し方が分かりません
3次の2次不等式を解け。
(1) x-2x+3<0
(2) x2-3x+4>0
(3) 2x+4x+5<0
(4) 3x?-12x+1420
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