3分間トレーニング第2回展開

初級編
(x+8)(x-2)
2
= x +6x-16
2
(x+7)
2
= x +14x+49
2
(x-4)
2
= x -8x+16
(x+2)(x-2)
2
= x -4
(x-4)(x-9)
2
= x -13x+36
(x-6)(x+9)
2
= x +3x-54
2
(x+1)
2
= x +2x+1
2
(x-5)
2
= x -10x+25
(x+9)(x-9)
2
= x -81
(x-1)(x+2)
2
= x +xー2
2
(x+10)
2
= x +20x+100
2
(x-2)
2
= x -4x+4
(x-10)(x+10)
2
= x -100
(x+1)(x-9)
2
= x -8x-9
(x+10)(x-2)
2
= x +8x-20
(x-4)(x-10)
2
= x -14x+40
2
(x+9)
2
= x +18x+81
2
(x-3)
2
= x -6x+9
(x+5)(x-5)
2
= x -25
つづく・・・
修行はまだ続く!