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標題: F.2 factorization 3題 [打印本頁]

作者: billyconan 時間: 09-11-9 09:00 PM 標題: F.2 factorization 3題

本人5係好識做...緊急!!

[ 本帖最後由 billyconan 於 09-11-9 09:02 PM 編輯 ]

圖片附件: CCF02009119_00000.jpg (09-11-9 09:02 PM, 27.17 KB) / 下載次數 39
https://www.2000fun.com/forum.php?mod=attachment&aid=MjM3MTQ5fDIzZDRiZmQwfDE3ODA1NjA4MTd8MA%3D%3D

作者: 你死得未呀 時間: 09-11-9 10:11 PM

4條做法好類似

19. 25(x+1)^2-16(x-1)^2
   5^2(x+1)^2-4^2(x-1)^2
   [5(x+1)]^2 - [4(x-1)]^2
   [5(x+1)+4(x-1)][5(x+1)-4(x-1)]
   [5x+5+4x-4][5x+5-4x+4]
   (9x+1)(x+9)

21. 9p^2-q^2-12p-4q
   3^2p^2-q^2-4(3p+q)
   (3p)^2-q^2 -4(3p+q)
   (3p+q)(3p-q)-4(3p+q)
   (3p+q)(3p-q-4)

22  m(x+y)^2-4m(x-y)^2
   m[(x+y)^2-2^2(x-y)^2]
   m{(x+y)^2- [2(x-y)]^2}
   m[(x+y)+2(x-y)][(x+y)-2(x-y)]
   m[x+y+2x-2y][x+y-2x+2y]
   m(3x-y)(3y-x)

18. 2-18(a+1)^2
   2[1-9(a+1)^2]
   2[1^2-3^2(a+1)^2]
   2[1^2-[3(a+1)^2]
   2[1+3(a+1)][1-3(a+1)]
   2[1+3a+3][1-3a-3]
   2[3a+4][-2-3a]
   -2(3a+4)(3a+2)

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