Math Is Fun Forum

esatpllana

Member

Registered: 2007-11-22

Posts: 12

help me please

can anyone solve this for me

this is with imagine numbers (i)

Last edited by esatpllana (2007-11-25 07:24:35)

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bossk171

Member

Registered: 2007-07-16

Posts: 305

Re: help me please

I don't know, I think I just made it worse...

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There are 10 types of people in the world, those who understand binary, those who don't, and those who can use induction.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: help me please

You made a mistake with the minus/plus signs in the middle.

bossk171

Member

Registered: 2007-07-16

Posts: 305

Re: help me please

It could be just that I had a long day at work but... really?

a/c - b/c = (a-b)/c

No? I don't doubt that I'm wrong here (like I said: long day) you do tend to be awesome at this kind of thing, but I'm not getting it.

(I feel like such a fool).

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There are 10 types of people in the world, those who understand binary, those who don't, and those who can use induction.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: help me please

bossk171

Member

Registered: 2007-07-16

Posts: 305

Re: help me please

Oh, math, yeah... like I said, long day.

Thanks.

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There are 10 types of people in the world, those who understand binary, those who don't, and those who can use induction.

esatpllana

Member

Registered: 2007-11-22

Posts: 12

Re: help me please

I think it's not good because we can't change places within substraction
a-b-c-d is not equal a-c-b-d 
bossk171 you change the places between fractions.

ok see you

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Ricky

Moderator

Registered: 2005-12-04

Posts: 3,791

Re: help me please

I think it's not good because we can't change places within substraction
a-b-c-d is not equal a-c-b-d

Yes, you can.  To see this, simply rewrite the above as addition:

a + (-b) + (-c) + (-d)

And addition is commutative.  So we may "move things around":

a-b-c-d = a + (-b) + (-c) + (-d) = a + (-c) + (-b) + (-d) = a - c - b - d.

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"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."

esatpllana

Member

Registered: 2007-11-22

Posts: 12

Re: help me please

wowwowo I don't know this thnx Ricky bye

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live your day
Mitrovica My City
tenth a class

esatpllana

Member

Registered: 2007-11-22

Posts: 12

Re: help me please

look I can't understand you boss147 how you do this can you explain this problem bye

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live your day
Mitrovica My City
tenth a class