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48/2(9+3) = ?

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henry_yew Male
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  #11 Old 19-04-2011 Default Re: 48/2(9+3) = ?

Quote:
Originally Posted by CissNei View Post
1/2X where X = 2?
Quote:
Originally Posted by youngyew View Post
Huh what are you referring to CissNei?
I think CissNei is trying to ask why we cannot view the division as a fraction, e.g. ⅜, ⅞, ? etc.

Well, actually the original poster didn't use the "/" symbol to mean "divide by". The original poster actually wanted to denote the conventional "divide by" symbol (the one dash with one dot above it, and one below). Had he written the operation in a fraction form like this:

48
-------
2(9+3)

(desperate way of writing fractions in ReCom)

then the answer would have been 2. In the usual way of writing the above fraction, it would be 48/[2(9+3)]. CissNei, your fraction as quoted above, would have been written as 1/(2x).

sin 2x, cos 2x and tan 2x are all understood as sin (2x), cos (2x) and tan (2x). However, sin 2x + 5 is not the same as sin (2x + 5)! The former would have been interpreted as sin (2x) + 5.

Confused? I'm not a mathematician either. Ask one. Haha...
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  #12 Old 19-04-2011 Default Re: 48/2(9+3) = ?

try typing 48%2(9+3) in your calculators... some give 2 some give 288

%= divide symbol... i think its just one of the many curiosities of math
lesson is, add more brackets to be precise about what ur calculating...
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  #13 Old 19-04-2011 Default Re: 48/2(9+3) = ?

Quote:
Originally Posted by CissNei View Post
1/2X where X = 2?
1/2X = 1/2*X strictly speaking or

Don't confuse it with
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  #14 Old 19-04-2011 Default Re: 48/2(9+3) = ?

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Originally Posted by surayahamdan View Post
1/2X = 1/2*X strictly speaking or

Don't confuse it with
Again, a casual reader tends to take 1/2x as one over two x, because it's precisely how we would read it as it was written.

However, a strict computer system would simply define any two items put next to each other as a product, and it usually doesn't add any brackets to a statement. Therefore, since there is nothing between 2 and x, and that there wasn't any bracket in the expression 1/2x, a computer system will just interpret it as one, divided by two, multiply by x. In other words, x/2.

Addition: But then again, it also depends on whether the computer system has additional "intelligent" features. Sometimes software designers try to teach computer the nuances of mathematical expression and the way people usually write it which is against the strict syntactic rules, so it tries to "guess" what you really mean by breaking the strict rules.

You can try it out at WolframAlpha which uses the Mathematica software which is one of the most popular mathematical softwares used by professional mathematicians. When you type 1/2x, it actually guesses that you mean 1 over 2x. However, if you type 1/2xy, it goes back to the strict computer rule, and gives you one divided by two, multiply by x, multiply by y.

Confusing. Which is why we should be as clear as possible when we input mathematical expression.
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Last edited by youngyew; 19-04-2011 at 08:56 PM. Reason: Automerged Doublepost
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  #15 Old 19-04-2011 Default Re: 48/2(9+3) = ?

Just a trivia, this math question was started on 4chan to troll people. There are some other variations but I'm just too lazy to find them.
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  #16 Old 20-04-2011 Default Re: 48/2(9+3) = ?

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Originally Posted by surayahamdan View Post
Just a trivia, this math question was started on 4chan to troll people. There are some other variations but I'm just too lazy to find them.
Won't be surprised. There's some troll potential in this one. That being said, I didn't get it off 4chan

Anyways as to the original question, I would've done gotten 288, and interpreted 1/2X as 1/2 * X.

Was curious about how people would interpret the "division" sign as opposed to the "/" sign.
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  #17 Old 09-06-2011 Default Re: 48/2(9+3) = ?

Best reply to the equation ever:
http://www.youtube.com/watch?v=a-e8fzqv3CE
Do watch her other videos as well, she presents mathematics in such a fun way you would wish she was your maths teacher in high school!

It's like saying, "I would like some juice or water with ice".

WIN.
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Last edited by youngyew; 09-06-2011 at 06:50 PM. Reason: Automerged Doublepost
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  #18 Old 09-06-2011 Default Re: 48/2(9+3) = ?

ah, Vhart! She makes the most interesting maths videos. <3
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  #19 Old 12-06-2011 Default Re: 48/2(9+3) = ?

Quote:
Originally Posted by youngyew View Post
Best reply to the equation ever:
http://www.youtube.com/watch?v=a-e8fzqv3CE
Do watch her other videos as well, she presents mathematics in such a fun way you would wish she was your maths teacher in high school!

It's like saying, "I would like some juice or water with ice".

WIN.
I almost cried when she drew crocodiles as a sign for some operation.

And yes, I think the equation is dumb!
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  #20 Old 16-06-2011 Default Re: 48/2(9+3) = ?

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Originally Posted by Cactus View Post
I almost cried when she drew crocodiles as a sign for some operation.

And yes, I think the equation is dumb!
me too
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