高考问答议论文论据素材50字:求助初二数学——分解因式
来源：百度文库 编辑：高考问答 时间：2024/04/28 09:27:58
1)(ab)^2-a^2-b^2+1
2)(x-y)^2-3x+3y-40
3)4x^2-9y^2+6y-1
2)(x-y)^2-3x+3y-40
3)4x^2-9y^2+6y-1
1)(ab)^2 -a^2 - b^2 + 1
(ab)^2 -a^2 - b^2 + 1
= a^2(b^2 - 1) - (b^2 - 1)
= (a^2 - 1)(b^2 - 1)
= (a + 1)(a - 1)(b + 1)(b - 1)
2)(x - y)^2 - 3x + 3y - 40
(x - y)^2 - 3x + 3y - 40
= (x - y)^2 - 3(x - y) - 40
= (x - y - 8)(x - y + 5)
3)4x^2 - 9y^2 + 6y - 1
4x^2 - 9y^2 + 6y - 1
= (2x)^2 - [(3y)^2 - 2*3y + 1]
= (2x)^2 - (3y - 1)^2
= (2x + 3y - 1)(2x - 3y + 1)