Mathematics
Senior High
この問題の解き方を記述式で教えて欲しいです！
230. 2 つの2 次方程式x?-4x+2a=0,x2-2ax+a+12=0 が次のような解
をもつとき定数aの値の範囲を求めよ.
(1) 少なくとも一方が実数解をもつ.
(2) 一方のみが実数解をもつ.
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