唔識做呀!!!thx!

2007-08-01 11:59 pm
因式分解
r 1
1) ---+---
3 6

5a^2 7a
2 )-------+-------
  3 6

3) 4(b-c)^2-2(b-c)

回答 (1)

2007-08-02 12:12 am
✔ 最佳答案
   r     1
1)───── + ───
   3     6

   2r + 1
= ────────────
      6

   5a^2     7a
2)───────── + ────
     3      6

   10a^2 + 7a
= ────────────────
       6

   a(10a + 7)
= ─────────────────
       6

3)4(b-c)^2 - 2(b-c)
= 2(b-c)(2(b-c)-1)
= 2(b-c)(2b-2c-1)


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