199 réponses à ce sujet

[Bjelseth]

 http://forum.bodybui...php?t=133389973
What is the answer? I fail at math, even basic ****.
48÷2(9+3) = ????
2 or 288?


Also how do I add a poll to this post?

Edit: Poll.
http://social.biowar...79/polls/18184/

Modifié par Bjelseth, 08 avril 2011 - 10:46 .

[Godak]

It's two. Parentheses first.

It'll go...48/2(9+3)

48/2(12)

48/24

2.

[mousestalker]

48/2(9+3)=x
48/2(12)=x
24(12)=x
24*12=288

The thread you linked to mentioned Wolfram Alpha, which also yielded 288. Why on earth are you wasting time on this?

Modifié par mousestalker, 08 avril 2011 - 02:44 .

[Godak]

mousestalker wrote...

48/2(9+3)=x
48/2(12)=x
24(12)=x
24*12=288

The thread you linked to mentioned Wolfram Alpha, which also yielded 288. Why on earth are you wasting time on this?

Get rid of parentheses first. Always. Order of operations.

[Mistress9Nine]

Godak wrote...
Get rid of parentheses first. Always. Order of operations.

Even then it's 48/2*12. So it's 288. You could just type it into Google you know.

Modifié par Mistress9Nine, 08 avril 2011 - 02:58 .

[vometia]

Looks like 288 to me. The implied multiplier is still secondary in preference to the divider (unless I'm missing something) though actual mathematicians may care to quibble (or not).

[Godak]

Mistress9Nine wrote...

Godak wrote...
Get rid of parentheses first. Always. Order of operations.

Even then it's 48/2*12.

The parentheses do not disappear. They imply multiplication, yes, but you do not change the parentheses to a multiplication symbol. If you do, you get the wrong answer because you change the order of operations.

EDIT: If you don't believe me, type the problem into its entirety into a calculator, parantheses and all. Dos.

Modifié par Godak, 08 avril 2011 - 03:03 .

[Elencia]

Godak wrote...

It's two. Parentheses first.

It'll go...48/2(9+3)

48/2(12)

48/24

2.

While you came up with the correct answer, you are technically supposed to apply the 2 to both numbers in brackets, eg.

48/2(9+3)
=48/(18+6)
=48/24
=2

EDIT: Excuse me, I failed, you were coreect

Modifié par Aiomon, 08 avril 2011 - 03:03 .

[Godak]

Aiomon wrote...

EDIT: Excuse me, I failed, you were coreect

It should be correct either way. Yours is just more work.

[Seagloom]

I get enough of this at school. ~Flees in terror while screaming PEMDAS~

[NeroSparda]

Godak, shall you be my tutor for my math course?

[Norskatt]

mousestalker wrote...

48/2(9+3)=x
48/2(12)=x
24(12)=x
24*12=288

The thread you linked to mentioned Wolfram Alpha, which also yielded 288. Why on earth are you wasting time on this?

I was seriously going to reply by telling them to ask mousestalker (you) becase you know the website for mathy things 

[Madame November]

Math is sexy, as long as you are doing it and not me.

[Godak]

NeroSparda wrote...

Godak, shall you be my tutor for my math course?

No. I'm not a huge fan of math, actually.

[Ponce de Leon]

Parenthesis first, then the multiplication between parenthesis and the 2, and only THEN you divide.

2 is the result. Says the chemist.

[vometia]

Godak wrote...

EDIT: If you don't believe me, type the problem into its entirety into a calculator, parantheses and all. Dos.

I tried this with my usual calculator, Unix's bc.  It said "syntax error".  Oh well.

Edit: though if I visualise it as a normally expressed fraction, i.e.



   48
---------
 2(9+3)

I can see why the result would be 2.

Modifié par vometia, 08 avril 2011 - 03:16 .

[TheMufflon]

Godak wrote...

No. I'm not a huge fan of math, actually.

As is quite evident from your faulty calculations. You only resolve the contents of the parentheses first, operations on the parentheses are resolved as normal. I.e. you get 48/2*12, which is resolved from left to right: 24*12 = 288

[Godak]

TheMufflon wrote...

You only resolve the contents of the parentheses first, operations on the parentheses are resolved as normal. I.e. you get 48/2*12, which is resolved from left to right: 24*12 = 288

No, no, and no.

Think of it like this...

48

OVER

2 (9+3)

Does that help?

You need to get rid of the twelve before division.

[Ponce de Leon]

^
This. The rule we use here : when you divide, simplify the number that you're going to use to divide as much as you can (the number below)
48
---
2(9+3)

48
---
2(12)

48
---
24

2

[Ponce de Leon]

Unless, the count is

48
--- *2
(9+3)

But the OP stated it otherwise, so, it's 2. If it were after the parenthesis then the result would be different, in fact, 8.

Edit : math failure is math failure. 

Modifié par dark-lauron, 08 avril 2011 - 03:23 .

[FlintlockJazz]

Godak is right. Godak rules all! Sorry, had Tiax in my head then, but yeah Godak is right.

EDIT:  And Dark-Lauron posts twice with detailed instructions on why he is right in the time it took me to write that, god I'm slow.

Modifié par FlintlockJazz, 08 avril 2011 - 03:24 .

[mousestalker]

Here's a thought, check out this website. It was established by a real live mathematician to answer mathy questions.

As for order of operation, you resolve the addition first (9+3) as it is between parentheses. Then you resolve all multiplicative and divisive operations going left to right.

I now despair for the future of the human race.

Are you all happy now?

[TheMufflon]

Godak wrote...

Think of it like this...

48

OVER

2 (9+3)

Nope. That would be expressed as 48/(2(9+3)). The expression posted by the OP is equalivient to 48 over 2, times (9 + 3).