Re: 輝煌光の皇神刃 ( No.249 )
日時: 2017/11/09 23:57 
名前: 雪◆EEpoFj44l.

よっしゃあktkr

(2x-y)二乗-3x(2x-y)=
6y(3x-y)-3(3x-y)二乗=
(x-2y)二乗-3x(x-2y)=