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- - Math question (https://gfy.com/showthread.php?t=771199)

Quote:

Originally Posted by cyberxxx (Post 13135224)

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"

Math and php code are two different things :2 cents:

Quote:

Originally Posted by Matiz (Post 13135229)

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:

-25/27x (where x is 54) is the same as:

-25/27*54

and it's a same as:

-25
---- 54
27

and that's you have to type in instacalc.

But(!!!) if you type there -25/(27*54)

it would be

-25
----
27*54

and it would be

-25/(27*x) but NOT -25/27x

Haven't you learn this in the 1st or 2dn degree of preliminary school? What's a funny thread :)

Quote:

Originally Posted by Matiz (Post 13135283)

Math and php code are two different things :2 cents:

How many programming languages do you know to make such a statement? Sorry but you're wrong again. PHP as well as all the popular programming languages (C/Pascal/Fortran) use STANDARD MATH CALCULATING MODEL. And please don't tell me that http://instacalc.com/ calculator also uses non-standard math calculating :)

Quote:

Originally Posted by cyberxxx (Post 13135224)

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

BTW
Yes, you are absolutely correct :winkwink:

because you changed the parentheses in the quoted post

Quote:

Originally Posted by Matiz (Post 13135336)

BTW
Yes, you are absolutely correct :winkwink: because you changed the parentheses in the quoted post

Are you kidding? Where exactly I changed something? Show me the original post and the one I changed while quoting it. :disgust

1) -25/27x = -25 / 27 * x
2) -25/(27x) = -25 / (27 * x)

Those are different ones. Because (1) <> (2).

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

-25/27x + 24/27 = 1/3 ( find a common denominator in this case 27 )

-1/27x = 1/3 ( do a simple subtraction of -25 + 24 = -1 )

-1/27 / 3/1 = x ( separate the x from the equation... -1/1 = -1 and 27/3 = 9 )

-1/9 = x ( now x has been solved ! )

-1/27 * -1/9 = 1/3 ( now the -1/27x is like saying -1/27 * x or -1/27 * -1/9 )

-1/27 / 9/-1 = 1/3 ( invert to cancel out... -1/-1 = 1 and 27/9 = 3 )

1/3 = 1/3

.

Quote:

Originally Posted by cyberxxx (Post 13135354)

Are you kidding? Where exactly I changed something? Show me the original post and the one I changed while quoting it. :disgust

No, you didn't change anything while I was quoting it.

But, the part I qouted is quite different from your argument in this thread.

Ok, I have to watch my postcount. I will take a break now.

Quote:

Originally Posted by D (Post 13135127)

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

:thumbsup I guess here at GFY you will find people trolling about anything, if I would put 1 + 1 = 2 it would be more or less the same :2 cents:

Quote:

Originally Posted by CarlosBS (Post 13135880)

:thumbsup I guess here at GFY you will find people trolling about anything, if I would put 1 + 1 = 2 it would be more or less the same :2 cents:

Sure it would. For example if I'd like to troll about 1+1=2, I'd ask: "are you sure you typed it correctly?" ::) Perhaps the second argument was a complex value (say an imaginary 1), so I could assume you meant this:

1 + (0+i1) = 2

which is wrong because the result is also a complex value = 1+i1 <> 2 (since a complex presentation of 2 = 2+i0)

Someone would definitely try to say that 1+i1 = 2, but I will insist that 1+i1 <> 2+i0 and this thread will get at least 3 new pages :winkwink:

j/k :)

Quote:

Originally Posted by tony404 (Post 13131898)

I had to take Algebra twice sorry no help here but my wife is a wiz let me get her.

Story of our lives..:thumbsup

0.999 = 1. Hope that helps.

Quote:

Originally Posted by alex_1980 (Post 13133994)

-25
---- x
27

I really can't believe this is my first visit to GFY today, and this thread is at the top of page one. Amazing.

Just an FYI, about an hour after I posed the question it was revealed to me that the equation above is the actual question.

For those using decimals, not applicable . . the test is purely fractions, not decimals.

Thanks though.

Quote:

Originally Posted by baddog (Post 13136308)

I really can't believe this is my first visit to GFY today, and this thread is at the top of page one. Amazing.

GFY community is studying math these 2 days - a good tendency IMHO :winkwink:

Quote:

Originally Posted by cyberxxx (Post 13136294)

ha ha I KNEW this will happen! beat it - NO COMPLEX VALUES !!

Baddog, listen to the sensible and check no. 68 for a way how to cope with it.. I am off

Quote:

Originally Posted by hjnet (Post 13132397)

I 2nd that, although I'd say it would need a 12-13 year old non-retarded child IMHO.

It is 8th grade level. So that would be right.

Quote:

Originally Posted by cyberxxx (Post 13136339)

GFY community is studying math these 2 days - a good tendency IMHO :winkwink:

I will have a spelling test tonight . . stay posted.

Quote:

Originally Posted by baddog (Post 13136359)

I will have a spelling test tonight . . stay posted.

No, sorry those spelling tests are not for me. I had "3" (an equivalent of your "C") for English when I learned it at the school. So I'll pass that test over :1orglaugh

P.S. I had "3" for Math too :)

This has became a very educational thread.. Never new that there are so many Math genius here:thumbsup

Quote:

Originally Posted by baddog (Post 13136450)

Three pages?

Seems so.

Basic math gets mad views.

Start a thread attempting to discuss google eigenvalues for determinging pagerank, though, and you'll get 8 views, and no replies. :1orglaugh

Quote:

Originally Posted by shekinah (Post 13136434)

This has became a very educational thread.. Never new that there are so many Math genius here:thumbsup

math geniuses? I really wouldn't call my self a math genius for solving that :upsidedow

Quote:

Originally Posted by D (Post 13136476)

Seems so.

Basic math gets mad views.

Start a thread attempting to discuss google eigenvalues for determinging pagerank, though, and you'll get 8 views, and no replies. :1orglaugh

Because you''ll get a RIGHT answer in the 1st reply and there will be nothing to discuss. E.g.:

Code:

<?

define('GOOGLE_MAGIC', 0xE6359A60);



//unsigned shift right

function zeroFill($a, $b)

{

    $z = hexdec(80000000);

        if ($z & $a)

        {

            $a = ($a>>1);

            $a &= (~$z);

            $a |= 0x40000000;

            $a = ($a>>($b-1));

        }

        else

        {

            $a = ($a>>$b);

        }

        return $a;

}





function mix($a,$b,$c) {

  $a -= $b; $a -= $c; $a ^= (zeroFill($c,13));

  $b -= $c; $b -= $a; $b ^= ($a<<8);

  $c -= $a; $c -= $b; $c ^= (zeroFill($b,13));

  $a -= $b; $a -= $c; $a ^= (zeroFill($c,12));

  $b -= $c; $b -= $a; $b ^= ($a<<16);

  $c -= $a; $c -= $b; $c ^= (zeroFill($b,5));

  $a -= $b; $a -= $c; $a ^= (zeroFill($c,3));   

  $b -= $c; $b -= $a; $b ^= ($a<<10);

  $c -= $a; $c -= $b; $c ^= (zeroFill($b,15));

   

  return array($a,$b,$c);

}



function GoogleCH($url, $length=null, $init=GOOGLE_MAGIC) {

    if(is_null($length)) {

        $length = sizeof($url);

    }

    $a = $b = 0x9E3779B9;

    $c = $init;

    $k = 0;

    $len = $length;

    while($len >= 12) {

        $a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));

        $b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));

        $c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));

        $mix = mix($a,$b,$c);

        $a = $mix[0]; $b = $mix[1]; $c = $mix[2];

        $k += 12;

        $len -= 12;

    }



    $c += $length;

    switch($len)             

    {

        case 11: $c+=($url[$k+10]<<24);

        case 10: $c+=($url[$k+9]<<16);

        case 9 : $c+=($url[$k+8]<<8);

        case 8 : $b+=($url[$k+7]<<24);

        case 7 : $b+=($url[$k+6]<<16);

        case 6 : $b+=($url[$k+5]<<8);

        case 5 : $b+=($url[$k+4]);

        case 4 : $a+=($url[$k+3]<<24);

        case 3 : $a+=($url[$k+2]<<16);

        case 2 : $a+=($url[$k+1]<<8);

        case 1 : $a+=($url[$k+0]);

         /* case 0: nothing left to add */

    }

    $mix = mix($a,$b,$c);

    return $mix[2];

}



function strord($string) {

    for($i=0;$i<strlen($string);$i++) {

        $result[$i] = ord($string{$i});

    }

    return $result;

}



function getrank($url) {

$url = 'info:'.$url;

$ch = GoogleCH(strord($url));



$file = "http://www.google.com/search?client=navclient-auto&ch=6$ch&features=Rank&q=$url";

$data = file($file);

$rankarray = explode (':', $data[0]);

$rank = $rankarray[2];

return $rank;

}



$url = "http://www.gfy.com";

echo 'GFY PageRank is '.getrank($url);

?>

No one is interested to discuss something everyone knows about :winkwink:

Quote:

Originally Posted by Nicky (Post 13136499)

math geniuses? I really wouldn't call my self a math genius for solving that :upsidedow

I believe he was being sarcastic :)

Bump... for the sake of math...

^^

.

Quote:

Originally Posted by cyberxxx (Post 13136563)

Because you''ll get a RIGHT answer in the 1st reply and there will be nothing to discuss. E.g.:...

That's cool code - thanks for that...

But I'm thinking that's gotta be a "for example" kinda thing... there's gotta be more than 3 columns in the matrix... maybe 3 columns of columns... of columns...

Jesus.. A rudimentary calloc() in PHP completed with bitshifting.

I'm gonna go get drunk before I see that in production. :thumbsup :1orglaugh

:1orglaugh... Bump... :1orglaugh

:upsidedow
.