几道因式分解

显示全部楼层 · 2009-4-11 21:33:57

因式分解
x^2(x-y)+(y-x)
16（x-1)^2-(x+2)^2
(x-2-(x-4)+1
这题是计算：48^2+48*24+12^2
第三题(x-2)(x-4)+1

千问 · 2009-4-11 21:33:57

1.x^2(x-y)+(y-x)=x^2(x-y)-(x-y)=(x-y)(x^2-1)=(x-y)(x+1)(x-1)2.16(x-1)^2-(x+2)^2=[4(x-1)+(x+2)][(4(x-1)-(x+2)]=(5x-2)(3x-6)=3(5x-2)(x-2)3.(x-2-(x-4)+1看不懂4.48^2+48*24+12^2=48^2+2*48*12+12^2=(48+12)^2=60^2=3600...

千问 · 2009-4-11 21:33:57

x^2(x-y)+(y-x) =x^2(x-y)-(x-y)=(x-y)(x^2-1)=(x-y)(x-1)(x+1) 16(x-1)^2-(x+2)^2 =[4(x-1)-(x+2)][4(x-1)+(x+2)]=(4x-4-x-2)(4x-4+x+2)=(3x-6)(5x-2)=3(x-2)(5x-2)(x-2...

千问 · 2009-4-11 21:33:57

1.x^2(x-y)+(y-x)=x^2(x-y)-(x-y) =(x-y)(x^2-1)=(x-y)(x+1)(x-1) 2.16(x-1)^2-(x+2)^2 =[4(x-1)+(x+2)][(4(x-1)-(x+2)] =(5x-2)(3x-6) =3(5x-2)(x-2) 3.=x^2-6x+8+1=x^2-6x+9=...

千问 · 2009-4-11 21:33:57

第一个把+(y-x)改成-（x-y)然后提取公因式（x—y）第一个你应该会了吧！...

千问 · 2009-4-11 21:33:57

^ 是什么啊...