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CP's math question

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chin:

--- Quote from: kido on 08 May 2011, 19:24:07 ---I understand both side 's arguement, one side says it's similAr to 1-2+3, it should be seen as -1+3=2, using other side's argument would evaluate 1-5=-4, also the priority of multiplication and divisions the same, hence the answer should be 3*3=9.

The other side view the formula as 6 / 2x and x is 3. And thus I think this is a case of ambiguity. I personally would like to view it as later case  :D


--- End quote ---

If a formula only have additions and subtractions and without any bracket, you can operate in any order.
But once a division come into the picture, you have to be careful about the order, unless you first transform the division into multiplication.

I also do not agree with your example of 6/2X means 2X operate first. The only time I would operate the 2X first is when the expression is written as

  6
----
 2X

which effectively is 6/(2X).

hangchoi:
We can ask our math teacher on 8 July

chin:

--- Quote from: hangchoi on 10 May 2011, 16:51:13 ---We can ask our math teacher on 8 July

--- End quote ---

 ;D

wongyan:
6/2x should be expressed as 6x/2 then to avoid any ambiguity.

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