不等式「x^2-2x+5 lt=0」のすべての解の集合は
二次方程式 |完成平方法 | x²+2x-5=0
x^2 + 2x + 5 = 0 を解く
x^2 + 2x - 5 = 0
👍Solve Quickly By Completing The Square 2x^2-3x-5=0 | Here Is Easy Guide...
複素数を使用した二次方程式の解き方: x2 + 2x + 5 = 0 および x2 − 4x + 5 = 0
x^2 - 2x + 5 = 0
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