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04-08-2011, 10:17 AM   #22
Numinous
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Re: 48÷2(9+3) = ??

Quote:
 Originally Posted by AniMeFaN im not inclined to say its (2/3)*4, that is how you read the equation, multiplication and division are equal so you do the equation from left to right in a situation with both. its order of operations.
Except that's how YOU read the equation. For me, since both operations have the same weight, the lack of proper annotation makes both (2/3)*4 and 2/(3*4) have the same validity. There's a reason for brackets in math, and this is it: to indicate which is the pivotal operation.

Quote:
 how is the equation faulty, its an equation.
But it lacks proper annotation! Nobody is saying the equation is nonsensical, I'm only saying that it'll lead to ambiguity, which already has: you say 2, kluang says 288. And both of you solved the equation with equally valid processes. Now tell me how that happens if it isn't faulty?

Quote:
 there has to be a definitive school of thought and consensus on this
It's called using brackets. Give it a try sometime.

Quote:
 but the equation isnt faulty. most people actuayll accept the answer as 2.
So it was 500 in 1000, now is most people? Make up your mind, will you?

Quote:
 "The general consensus among math people is that "multiplication by juxtaposition" (that is, multiplying by just putting things next to each other, rather than using the "×" sign) indicates that the juxtaposed values must be multiplied together before processing other operations"
@ bolded: consensus=/= rule. I know of people that use juxtaposition for exponential. I don't do that, since most quimiobiophysic equations use the consensus you referenced, but since politeness is never enough, use "x" or "*" to indicate the multiplication.

But you said:
Quote:
 that is how you read the equation, multiplication and division are equal so you do the equation from left to right in a situation with both
So is 48/2=24=>24*(9+3)=>24*12=288

But, like ACt said, if you consider the ÷ as a separation of fraction, it's 48/(2*(9+3))=48/(2*12)=48/24=2

See? You just backed up both claims, which shouldn't happen in a proper equation.
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Last edited by Numinous; 04-08-2011 at 10:19 AM.

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