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chrissam
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Reg.: Oct 2004
Location:
Posts: 397

@mathe cracks

es geht ums differenzieren


§.... differnzierzeichen
^... hoch
/.....durch

§(x^7/4)= ???

also um euer gedächtnis aufzufrischen x^7 wird zu x^8/8, nur was passiert dann mim 4er der ja schon unterm bruchstich is?

stimmt: §(x^7/4)=x^8/32 +C ?

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Old Post 17-02-2006 - 15:34
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Se.Vero
klub sir3ne

Reg.: Jun 2004
Location: quite near....
Posts: 950

§(x^7/4)=x^8/32 +C ?


*ggg*

jaja mathe -- war immer schon meine spezialität!
lol

mahh bin i froh dass i des schon so lang hinter mir hab..
herzliches beileid.

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Old Post 17-02-2006 - 15:43
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Jubilee
king tschubby

Reg.: Apr 2003
Location: kingdom of doom
Posts: 2049

1. differenzierzeichen? huh?

ich nehm an du meinst f(x) = (x^7)/4 und suchst f'(x)

quotientenregel z.b. da:




=> f'(x) = ((7*x^6)*4)/16 = 7/4 *x^6

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Old Post 17-02-2006 - 15:47
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tenchu
the cake is a lie!

Reg.: Jun 2002
Location:
Posts: 1112

Bitte drück dich mal mathematisch korrekt aus!

Differenzieren:

f(x)=1/4*x^7
f'(x)=7/4*x^6

Hier wahrscheinlich dein FALL!
f(x)=x^(7/4)
f'(x)=7/4*x^(7/4 -1)=7/4*x^(3/4)


Das was du unten machst ist falsch Integrieren!

differenzierregeln siehe auch


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Old Post 17-02-2006 - 15:48
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Jubilee
king tschubby

Reg.: Apr 2003
Location: kingdom of doom
Posts: 2049

quote:
Originally posted by tenchu
Differenzieren:

f(x)=1/4*x^7
f'(x)=7/4*x^6



so angschrieben sogar noch leichter, ja

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dishing it out like a premiership footballer in a bentley showroom

it takes a teenage riot to get me out of bed right now

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Old Post 17-02-2006 - 15:50
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Se.Vero
klub sir3ne

Reg.: Jun 2004
Location: quite near....
Posts: 950

quote:
Originally posted by tenchu

Differenzieren:

f(x)=1/4*x^7
f'(x)=7/4*x^6






ahja!!

das hab ich aber so auch schon mal gesehen...
jetz kommts ma gleich nimma ganz so strange vor.

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Old Post 17-02-2006 - 15:53
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chrissam
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Reg.: Oct 2004
Location:
Posts: 397

bitte steingts mich jetzt nicht aber ich meinte integrieren

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Old Post 17-02-2006 - 15:55
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tenchu
the cake is a lie!

Reg.: Jun 2002
Location:
Posts: 1112

Und hier noch btw.
Integral(1/4*x^7)dx = 1/4 * 1/8 * x^8 + C = 1/32 * x^8 + C

Integral(x^(7/4))dx = 1/(7/4 + 1) * x^( (7/4) +1) + C = 4/11 * x^(11/4)


upsii hab den koeffizienten vergessen

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Last edited by tenchu on 17-02-2006 at - 16:11

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Old Post 17-02-2006 - 15:58
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tenchu
the cake is a lie!

Reg.: Jun 2002
Location:
Posts: 1112

tausend kopfnüsse!!!
aber ernsthaft, im wiki steht soetwas

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Old Post 17-02-2006 - 16:01
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chrissam
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Reg.: Oct 2004
Location:
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quote:
Originally posted by tenchu

(x^(7/4))dx =


ich brauch aber:

(x^7)/4 dx = ....

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Old Post 17-02-2006 - 16:02
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Jubilee
king tschubby

Reg.: Apr 2003
Location: kingdom of doom
Posts: 2049

quote:
Originally posted by tenchu
Und hier noch btw.
Integral(1/4*x^7)dx = 7/4 * x^8 + C





1/32 * x^8 + C

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dishing it out like a premiership footballer in a bentley showroom

it takes a teenage riot to get me out of bed right now

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Old Post 17-02-2006 - 16:03
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tenchu
the cake is a lie!

Reg.: Jun 2002
Location:
Posts: 1112

Ok, jetzt wirds echt bitter...

x^7 *1/4 = 1/4 * x^7 = x^7 / 4

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Old Post 17-02-2006 - 16:04
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Jubilee
king tschubby

Reg.: Apr 2003
Location: kingdom of doom
Posts: 2049

quote:
Originally posted by chrissam

ich brauch aber:

(x^7)/4 dx = ....



(x^7)/4 = 1/4 * x^7

du bräuchtest eher einen grundkurs (und das mein ich jetzt gar ned bös, weil wenns scho bei sowas happert brauchst mit differenzieren und integrieren gar nicht erst anfangen)

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dishing it out like a premiership footballer in a bentley showroom

it takes a teenage riot to get me out of bed right now

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Old Post 17-02-2006 - 16:05
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chrissam
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Reg.: Oct 2004
Location:
Posts: 397

quote:
Originally posted by Jubilee


1/32 * x^8 + C



also stimmt das eh:

((x^7)/4)dx=x^8/32 +C ?!

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Old Post 17-02-2006 - 16:05
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chrissam
.

Reg.: Oct 2004
Location:
Posts: 397

quote:
Originally posted by tenchu
Ok, jetzt wirds echt bitter...

x^7 *1/4 = 1/4 * x^7 = x^7 / 4


schon aber
quote:
(x^(7/4))dx

sieht für mich nach: x hoch siebenviertel mal dx aus, ich brauch aber x hoch sieben -und das ganze- durch 4

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Old Post 17-02-2006 - 16:08
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Jubilee
king tschubby

Reg.: Apr 2003
Location: kingdom of doom
Posts: 2049

quote:
Originally posted by chrissam

schon aber
sieht für mich nach: x hoch siebenviertel mal dx aus, ich brauch aber x hoch sieben -und das ganze- durch 4



wonachs für dich ausschaut is einerlei bei mathe geht punkt (in dem fall stern) trotzdem vor und ein ^ohne klammer gilt immer nur für die zahl danach

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dishing it out like a premiership footballer in a bentley showroom

it takes a teenage riot to get me out of bed right now

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Old Post 17-02-2006 - 16:14
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Se.Vero
klub sir3ne

Reg.: Jun 2004
Location: quite near....
Posts: 950

wenn ich mir die hölle vor geistigem auge ausmal, dann seh ich genau solche schriftzeichen.

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Last edited by Se.Vero on 17-02-2006 at - 16:29

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Old Post 17-02-2006 - 16:16
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infame
nasty dschango

Reg.: Nov 2001
Location: lohasianville
Posts: 1563

quote:
Originally posted by Se.Vero
wenn ich mir die hölle vor geistigem auge ausmal, dann seh ich genau solche schriftzeichen.


hehehe


finds grad erstaunlich wie vollständig gewisse informationen aus dem gehirn verschwinden können.
das is jetzt grad mal 6-7 jahre her und mir sagt das alles echt überhaupt nix mehr.

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kapitulation oooh kapitulation oooh

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Old Post 17-02-2006 - 17:00
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mrrooh
board freak

Reg.: May 2004
Location: VIE11
Posts: 644

bei mir is das gradmal ein jahr her, und wir ham das eigentlich nicht so auf gach in mathe durchgmacht, in statik haben wir das eigentlich regelmäßig gebraucht..
und ich tu ma sehr schwer mich an alles wieder zu erinnern

liegt aber wohl auch daran das ich in den letzten 6 monaten bis jetzt kein grund hatte mein gehirn irgendwie anzustrengen....
ich merks beim kopfrechnen, bin sowas von langsam wordn.
hm vielleicht wären mal so kleine denkübungen angesagt bevors wieder angeht mit uni.

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Old Post 17-02-2006 - 18:30
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Mabudo
Plattenleger

Reg.: Sep 2005
Location: Vienna Underground
Posts: 259

Arrow

bin grad vollmittendrinnen und hab weniger ahnung als mein kollege chrissam

aber wir schreiben mathe sa am pc, da kann man echt wenig falsch machen...

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Old Post 17-02-2006 - 18:38
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ToA
rookie

Reg.: Nov 2005
Location: daheim ;)
Posts: 7

*lol* i glaub jetz kriag i kopfweh

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Old Post 17-02-2006 - 20:21
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simple.fibre
SAN

Reg.: Jun 2002
Location:
Posts: 396

und der ganze scheiss dafür, dass einem ein fetter, alter sack einen zettel überreicht, seine schwitzende hand gibt und meint "gratulation, bestanden". pfui sag ich da.

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Old Post 17-02-2006 - 22:15
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phatsphere
snoozle's toppi-eyes

Reg.: May 2002
Location: 23.vie.at
Posts: 1009

oioioi ... alarm

ihr armen matheamputierten.

kleinen tipp, geh auf und tipp dort

x^(7/4) oder x^7/4 ein (je nachdem wie du es gemeint hast) und du wirst glücklich sein.

willst auch differenzieren, so gehe zu:

und tipp da
diff(x^7/4,x);
ein .. ";" am schluss wichtig

dort kannst auch noch anderes zeug rechnen, und auch integrieren

integrate(x^7/4,x);

wenn dir letzteres gefällt, kannst es dir da runterladen:
software geht bis auf die 1960-er jahre zurück, aber das heißt nicht, dass es deshalb scho falsch is

p

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Old Post 18-02-2006 - 12:16
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chrissam
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Reg.: Oct 2004
Location:
Posts: 397

quote:
Originally posted by phatsphere
oioioi ... alarm

kleinen tipp, geh auf


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Old Post 18-02-2006 - 19:21
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wenshiz
>>> e-lastic.at <<<

Reg.: Jun 2001
Location: Vienna
Posts: 145

quote:
Originally posted by infame

das is jetzt grad mal 6-7 jahre her und mir sagt das alles echt überhaupt nix mehr.



genau das habe ich mir auch gedacht... erschreckend...

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Old Post 19-02-2006 - 10:00
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