請教教我數學.....

2007-08-07 11:29 pm
3ax - 9x^2
-------------------- ← 分線
6x


幫我解答上面個題呀! thanks

回答 (4)

2007-08-07 11:35 pm
✔ 最佳答案
3ax - 9x^2
--------------------
6x

= 3x(a - 3x)
-----------------
3x(2)

= a - 3x
-------------
2
2007-08-08 12:33 am
3ax-9x^2
-------------
  6x
 (3a-9x)x<-----乘法分配性質
=------------
  6x
 [3a->a]-[9x->3x]
=------------------------ <-----約分(a->b即a約成b)
   6->2
 a-3x
=-------
 2

2007-08-07 16:38:32 補充:
對不起! (3a-9x)x=------------  6x該是 3x(a-3x)=------------  6x [3x->1](a-3x)=--------------------  [6x->2] a-3x=-------  2
2007-08-07 11:39 pm
3ax - 9x^2
___________

6x

3x(a - 3x)
= ___________

6x

(a - 3x)
= __________

2
參考: me
2007-08-07 11:35 pm
3ax/6x=a/2

9x^2/6x=3x/2

(3xa-9x^2)/6x=(a-3x)/2.

DONE.
參考: me


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