48÷2 (9+3) argument

SaiyanZ said:
?

1/2(9+3) = (9+3)/2

If you're saying that that is half times (9+3) then your're correct. If it is 1 divided by 2 into (9+3) then you're not.
Click to expand...

I'm saying
1/2(9+3) = 0.5(9+3) = (4.5+1.5) = 6

hence in the original question, it might as well have been written as
(48)(1÷2 (9+3)) = (48)(6) = 228
since

1÷2 (9+3) = 1/2 * (9+3)/1....

etc etc

my question to you would be:

what is sinπ(0.5) be equal to according to you?

according to me it is (0)(0.5) = 0 and not sin(π/2) = 1.
The same rule applies to fractions, since a fraction has two algorithms, one in the numerator and one in the denominator.
 
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zulgin said:
my question to you would be:

what is sinπ(0.5) be equal to according to you?
Click to expand...

The "sin" bit would take precedence over anything else, including brackets. So it would be (0)(0.5) = 0.
Any person that has done maths though would write it out like this: 0.5sinπ
 
SaiyanZ said:
The "sin" bit would take precedence over anything else, including brackets. So it would be (0)(0.5) = 0.
Any person that has done maths though would write it out like this: 0.5sinπ
Click to expand...

the exact same rule applies to a fraction. it is ideal to write it 0.5sinπ, however when it comes to derivatives of say sin(x^2) and when following the chain rule I usually do the outside then inside first, hence cos(x^2)*2x, simply because that is how my mind works, however 2xcos(x^2) would be the exact same thing.

anyways we seem to agree that an algorithm should take preference, but not the algorithm of a fraction, I'm saying that the rules state one needs to be consequent in mathematics, and algorithms take priorities over brackets.
 
A fraction is just a number like any other. Don't know what you're going on about. 48÷2 is not a fraction anyway.
 
SaiyanZ said:
A fraction is just a number like any other. Don't know what you're going on about. 48÷2 is not a fraction anyway.
Click to expand...

a fraction itself is a function

y = x/y..... hence it has an algorithm to represent a decimal value, and yes 48/2 is a fraction,

thus by saying sinpi(0.5) = 0 then 1/2(9+3) = 6 :), if not then you are not consequent and don't understand the 'voorkeur van bewerking' (BIDMAS?)
 
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I'm lost with what you're saying now. Go read my last few posts. It will dawn on you eventually.
 
SaiyanZ said:
I'm lost with what you're saying now. Go read my last few posts. It will dawn on you eventually.
Click to expand...

so you resort to "I don't understand what you are saying therefore you are wrong"...

let me put it out for you!

48/2(9+3)
= 48/2(12)
=48(0.5)(12)
=48(6)
- 228

maklik! rules state you have to do algorithms and brackets first,
a fraction has three
1) the numerator
2) the denominator
3) the numerator divided by the denominator

one may not use a number outside an algorithm before solving the algorithm first!
or else sinpi*0.5 would not be equal to zero.


Maklik ?:)
 
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48/2(9+3)
= 48/2(12)
=48(0.5)(12) ..this step is wrong. You can't add in new brackets.

Also, two numbers separated by a division sign is not a fraction until the actual division has taken place. Brackets come before division.

Everything has already been explained in the last couple of pages. I will just keep repeating the posts. Look at this post: http://mybroadband.co.za/vb/showthr...-3)-argument?p=5955920&highlight=#post5955920
 
SaiyanZ said:
48/2(9+3)
= 48/2(12)
=48(0.5)(12) ..this step is wrong. You can't add in new brackets.

Also, two numbers separated by a division sign is not a fraction until the actual division has taken place. Brackets come before division.

Everything has already been explained in the last couple of pages. I will just keep repeating the posts. Look at this post: http://mybroadband.co.za/vb/showthr...-3)-argument?p=5955920&highlight=#post5955920
Click to expand...

That post is wrongly read period. yes the paranthesis of the brackets take priority HOWEVER it is 0.5 that you are multiplying into the brackets and not 2...

/2 = 0.5 ..... the reason being that you can put infinite factors of '1' before it and my answer should remain the same, any number X1 = that number

Hence 48/2(9+3) = 48(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)/2(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(9+3)
= 48(1)(1)(1)(1)(1)(0.5)(1)(1)(1)(1)(1)(1)(1)(1)(6)

/2 is the number and not 2 itself BECAUSE 2 is in the algorithim of the denominator in order to get it out the algorithim has to be solved FIRST hence 1/2 must be converted to 0.5 BEFORE it can be multiplied into the brackets,


=228

so maklik soos dit!

does that clear it up?

two numbers separated by a division sign IS a fraction BECAUSE it is one TERM!!!

a term in mathematics can ONLY be separated by a plus and minus...

hence you do not know your basics.
http://en.wikipedia.org/wiki/Term_(mathematics)

In elementary mathematics, a term is either a single number or variable, or the product of several numbers or variables separated from another term by a + or - sign in an overall expression.
.
Click to expand...
 
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It is not 'maklik' the question is intentionally ambiguous!
288 and 2 are legitimate answers and how you get to either depends on your teaching.. The old school way =288 but if you ask a grade 5 or anyone thats matriculated with the past ~ 10 years? they'll most likely get 2..

It's just a difference in interpretation. I was taught the same way as SaiyanZ and thats to completely get rid of the brackets.

48 / 2 (9+3) is interpreted by us as

48
---------
2(9+3)
 
Let me get this straight... so the question is AMBIGUOUS and yet the very same people who admit this say they are correct??? lol, talk about self contradictions.

PS - you do all realise this is just one epic troll right?

PPS - 288 :p
 
nakedpeanut said:
It is not 'maklik' the question is intentionally ambiguous!
288 and 2 are legitimate answers and how you get to either depends on your teaching.. The old school way =288 but if you ask a grade 5 or anyone thats matriculated with the past ~ 10 years? they'll most likely get 2..

It's just a difference in interpretation. I was taught the same way as SaiyanZ and thats to completely get rid of the brackets.

48 / 2 (9+3) is interpreted by us as

48
---------
2(9+3)
Click to expand...

so our problem is Bantu Education OBE....


I still hold that your interpretation is wrong, there is a convention in mathematics to remove ambiguity, if you follow your ... terms /Bidmos rules then you can't go wrong.
Code:


Examples of potentially confusing ambiguous mathematical expressions
...................

a/2b which arguably should mean (a/2)b\, but would commonly be understood to mean a/(2b)

http://en.wikipedia.org/wiki/Ambiguity#Mathematical_notation
 
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Math: What is the answer?

I saw this in a 9Gag thread now, and the comments were crazy. Since I know all of you are so clever, what is the answer to this question?

428851_10150965962156840_317631303_n.jpg


48 ÷ 2(9 + 3) = ?
 
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2

48 ÷ 2(9 + 3)
48 ÷ 2(12)
48 ÷ 24
2
 
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