Another one :1orglaugh

Is there ANY DIFFERENCE between -25/27x and (-25/27)x ??? :helpme

is it five???????? i have no idea i got a poor mathematics skill

lol... is it a joke?
i used to do those in high school

Wrong answer, Sir.

Let's test your X. Here we go:

-25/27x + 8/9 = 1/3

so

-25/27 * 5/3 + 8/9 must be 1/3 = 0,3(3) right?

but -25/27 * 5/3 + 8/9 is -0.654320987654321

Thus your solution is wrong. The right answer is 3/5.

See:

-25/27x + 8/9 = 1/3
-25/27x + 24/27 = 9/27
-25x = 9 - 24
25/27x = 15/27
x = 15/25
x = 3/5

Now let's test my number with the original equation:

-25/27 * 3/5 + 8/9 = 0.3(3) which is 1/3

P.S. In Russia we were learning even more complicated square equations (you know ax^2 + bx + c = 0 where a <> 0) in the 4th grade (10 years old), so were learning the equations like solved above when we were even younger.

the denominator, its 5/3. Figure out where x is and you'll have the answer.
WG

-25/27x + 8/9 = 1/3 - can't you "find out" where is x there? :)

The answer is 5/3

-25/27x + 8/9 = 1/3

-25/27(5/3) + 8/9 = 1/3 Brackets are important here

-25/45 + 8/9 = 1/3

-25/45 + 40/45 = 1/3

15/45 = 1/3

1/3 = 1/3 TRUE

Call an engineer :1orglaugh

Are you sure??? :1orglaugh:1orglaugh:1orglaugh

My wooden Russian brain is telling me this:
-25/27*(5/3) + 8/9 = -25/27 * 5/3 + 8/9 = -0.65432098765 which is NOT equal to 1/3.

Where did you learn the math if you don't know what -25/27*(5/3) is ABSOLUTELY EQUAL to -25/27 * 5/3?

Wanna check? Go to http://instacalc.com/ and copy-paste both formulas there. I mean these:
1) -25/27*(5/3) + 8/9
2) -25/27 * 5/3 + 8/9

You may believe me or not, but you'll get THE SAME result which is -0.65432098765. As you can see, -0.65432098765 IS NOT EQUAL to 1/3.

Now copy-paste there the right one:
-25/27 * 3/5 + 8/9

...and you'll get the correct result 0.3(3) which is 1/3.

Ah yes... you may also use the brackets if it really does matter for you, e.g.:
-25/27 * (3/5) + 8/9
-25/27 * (3/5) + (8/9)
(-25/27) * (3/5) + (8/9)
(-25/27) * (3/5) + (8/9)
(-(25)/27) * (3/5) + (8/9)
etc... :winkwink:

Replace x with any random number > 1 and see for yourself :thumbsup

See what??? Just replace it with a right number which is 0.6 (you may consider it random if you want) and copy-paste it into http://instacalc.com/ like this:

-25/27 * 0.6 + 8/9

So what's the result? Isn't it 0.3(3)? Isn't 0.3(3) = 1/3 or isn't 0.6 = 3/5? :)

Feel free to ask more questions if you don't understand something. :winkwink:

Sorry, but you're wrong.

Put this in instacalc: -25/(27*(5/3)) + 8/9

I forgot the additional brackets but this is correct.

-25
----- <----- this fraction is not the same as this:
27x


-25
---- x
27


:thumbsup

are you looking at:

-25/27x or (-25/27)x ?

both options are very simple ..

shit, same second? :)

No, it's you wrong. Because:

Exactly! Open this post: http://www.gofuckyourself.com/showpo...69&postcount=1 and read the equation. It says: -25/27x which is equal to this:

-25
---- x
27

and IS NOT equal to this

-25
-----
27x

As I suggested above, just use http://instacalc.com/ to understand how exactly the following formula should be calculated: -25/27x

E.g. -25/27*54 = 50 but NOT -0.01714677641. Please don't tell me I'm wrong, just copy-paste the formula into the calculator here: http://instacalc.com/

Furthermore, they are EQUAL. I.e. -25/27x = (-25/27)x

I will concede that we are both correct and that the problem lies in the syntax of the formula.

I was reading -25/27x as meaning a fraction where 27x was the denominator.
ie: ((-1)(25))/((27)(x))

You read it as just an order of operations: (-1)(25)/(27)(x)

We are therefore both correct based on our own assumptions about the problem.

sorry, this is no equal.. :

(-25)/ (27x) = -25/ 27 . 1/x = -25/27x

(-25/27) . x = -25/27 . x/1 = -25x/27

:winkwink:

Syntax Error :upsidedow

Nope, the syntax of formula was absolutely exact. There are no 2 interpretations of -25/27x in math. It's ALWAYS equal to this:
-25
---- x
27

Otherwise it would be written as follows: -25/(27x). It's a main rule of brackets calculation. BTW, that's how ALL the programming languages do process such a formula. -25/27x is always -25 / 27 * x but never -25 / (27 * x)!

E.g.:

/* PHP */
$x = 50;
echo -25 / 27 * $x;

or

/* ANSI/ISO C */
x = 50;
printf("&#37;d\n", -25 / 27 * x);

or

(* ANSI Pascal *)
x := 50;
writeln(-25 / 27 * x);

and so on...

Hm, replace x with any number.. :2 cents:

No, just a copy-paste error. I meant this:

-25/27x + 8/9 = 1/3

is a same as

(-25/27) * x + 8/9 = 1/3

and it is a same as

-25 / 27 * x + 8/9 = 1/3

and of course it's not [-25 / (27x)] + 8/9 = 1/3

Yes, but how do you know that Baddog typed it in right? :winkwink:

x = 5/3... :thumbsup

Ugh... Why don't they equal? Can you read my post? I believe I wrote there:

Furthermore, they are EQUAL. I.e. -25/27x = (-25/27)x

Did I say anything about (-25)/ (27x)? Please be sure to read before you post a reply :winkwink:

Do you mean if I knew he was sober or not? :winkwink: Course I can't know that for sure. So I assume he was same when he posted the equation. I learned to take it "as is" but not to assume when I doing math calculations :)

Haven't you seen this post: http://www.gofuckyourself.com/showpo...1&postcount=51 ??? Do you think that 0.6 (3/5) is not "any number"? :upsidedow

And that was the true reason I asked to assure..

I have been studying cybernetics and maths for a while plus I was making some money tutoring maths for a while too, therefore I know that people usually don't know anything about syntax and you have to try to think ahead..

Allright, here is the solution in steps for both cases anyway:

1) -25/27x + 8/9 = 1/3

-25/27 x = 1/3 - 8/9

x = [(1/3 - 8/9) * 27 ] / (- 25)

----------------------------------------


2) (-25)/(27x) + 8/9 = 1/3

(-25)/ (27x) = 1/3 - 8/9

-25 = (1/3 - 8/9) * 27x

-25 / [(1/3 - 8/9)*27] = x


I love to work with numbers ..

Personally I assume that people have at least 3-degree education so they know how to use brackets. Perhaps because we are living in different countries with a way different level of basic (elementary) education :2 cents:

Quite the group of mathies on this board, lol.
WG

Yes, ours is in general way better and more demanding than most of the western (meaning in general and till secondary level and not super expensive universities), even not that intelecually gifted people were quite average once they moved abroad as I remember, this is 3rd till 5th grade elementary school if I am not mistaken..

What I am trying to say is that even EVERYONE come through the 5 th grade elementary school there is actually VERY FEW that would know how to use brackets once they are out of the school for a while..

It's absolutely natural and everyone have right to forget stuff he doesn't use, but also SHOULD NOT show off something he forgot.. :2 cents:

That post doesn't make this right:

If my calculations are correct, the answer is: 15,21

O'rly? :helpme That my post says exactly the following:

So you don't agree that -25/27x = (-25/27)x ???

be sure to check it on with a calculator. I.e. copy-paste these formulas into http://instacalc.com/ :
1) -25/27*54
2) (-25/27)*54

Let me know if you'll get a different result with one of the formulas above, professor :winkwink:

Hint: Both -25/27*54 and (-25/27)*54 ARE ABSOLUTELY EQUAL and they both = -50 :)

Furthermore, -25/27 * 0.6 + 8/9 is EQUAL to (-25/27) * 0.6 + 8/9 and it is 1/3 . Surprised? :winkwink:

No, they are not. The answer is 1/3 and it was shown above already.

Not too difficult an equation.

damn, what's wrong with gfy? i feel like i'm back at highschool... :Oh crap...
this thread needs some boobie pics ASAP...

You guys have done a great job of over complicating a rather simple problem (for a 9th grader). :thumbsup


FYI: you're simply wrong here. The only case where that's true is when x = {-1, 0, 1}; for any other value of x, your equality is false.

[ -25/27x = -25/(27x) ] is the valid statement.

I think it's just a syntax thing at this point - and perhaps (-25/27)x is what baddog meant but you're still wrong in what I quoted. No question there.

Math is an international language, and parentheses are everything in math... if your elementary math instructors taught you otherwise, you'd do well to write the givers of your early education a strongly-worded letter.

:2 cents:

4th grader here where I live :winkwink:

Another one... :disgust Where are you coming from guys? From a wood? :)

-25/27x = -25/(27x) is correct.

1) Try this PHP code if you want:

<?php
$x = 54; // some sample value
echo -25/27*$x . " = " . (-25/27)*$x;
?>

You will be surprised when you'll see the result because it will be "-50 = -50"

2) Don't have PHP at your server? Ok, I believe you are able to do this:

a) click at http://instacalc.com/
b) copy-paste this into the calculator's box: -25/27*54
c) remember the result (it will be -50)
d) copy-paste this into the calculator's box: -(25/27)*54
e) remember the result (it will be -50)
f) now compare the results you got in (c) and (e). aren't they equal?

(-25/27)x is baddog meant and it IS what he wrote. because:
(-25/27)*x = -25/27*x (note 2 ways to check it above)

PERIOD.

P.S. x = 54 in both samples and it does not belong to {-1, 0, 1} as you stated above.

Your syntax is still wrong:

-25/27x is the same as:


-25
----
27x


which you would to type into instacalc as the following:

-25/(27*54)

and what you would get is not -50 :winkwink: