x^2+9x+8 x^2-6x+9 x^2-x-12 x^2+10x+21 x^2-20x-125 2x^2+5x+3
问题描述:
x^2+9x+8 x^2-6x+9 x^2-x-12 x^2+10x+21 x^2-20x-125 2x^2+5x+3
答
①
x 8
x 1
(x+8)(x+1)
②
x -3
x -3
(x-3)^2
③
x 3
x -4
(x+3)(x-4)
④
x 3
x 7
(x+3)(x+7)
⑤
x5
x-25
(x+5)(x-25)
⑥
x1
2x 3
(x+1)(2x+3)