因式分解Form2唔識做help~~

2009-10-13 4:52 am
4(x-2)-(x-2)(x+1)
要步驟...
唔該...
剩係得e題唔識....
更新1:

仲有一題... 我試過做 不過答案又唔知岩唔岩.... 12a^2c^2-4ac^2 唔該....

更新2:

唔該曬~~ 我唸我應該明白了~ 唔該~~

回答 (4)

2009-10-13 4:55 am
✔ 最佳答案
4(x-2)-(x-2)(x+1)
= (x-2)[4 - (x+1)]
= (x-2)(4 - x - 1)
= (x - 2)(3 - x)



2009-10-12 21:09:25 補充:
12a^2c^2-4ac^2

= 4ac^2 (3a) - 4ac^2

= 4ac^2 (3a - 1)

002 waiyanandrea :

題目是因式分解

你做乜展開?
2009-10-13 7:33 am
4(x-2)-(x-2)(x+1)

= 4x-8x-(x^2+x-2x-2)

= -4x-(x^2-x-2)

= -4x-x^2+x+2

= x^2-3x+2
2009-10-13 5:09 am
001 沒錯
題目是因式分解
不是擴展
2009-10-13 5:02 am
4(x-2)-(x-2)(x+1)

= 4x-8x-(x^2+x-2x-2)

= -4x-(x^2-x-2)

= -4x-x^2+x+2

= x^2-3x+2

2009-10-12 21:04:06 補充:
001好似睇錯sign -3-
參考: me=]


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