Når faktorenes orden ikke er likegyldig?
Lagt inn: 15/11-2005 22:37
hei Alle sammen,
Jeg har blitt lært opp til å tro at faktorenes orden er likegyldig. At 9*7 er det samme som 7*9.
Men nå kom jeg over en tekst som påstår at det faktisk finnes tilfeller der denne regelen ikke gjelder. Der faktorenes orden ikke er likegyldig. Dette får meg til å undre.
There are three basic properties of numbers, and you'll probably have just a little section on these properties, maybe at the beginning of the course, and then you'll probably never see them again (until the beginning of the next course). Covering these properties is a holdover from the "New Math" fiasco of the 1960s. While these properties will start to become relevant in matrix algebra and calculus (and become amazingly important in advanced math, a couple years after calculus), they really don't matter a whole lot now.
Why not? Because every math system you've ever worked with has obeyed these properties. You have never dealt with a system where a×b didn't equal b×a, for instance, or where (a×b)×c didn't equal a×(b×c). Which is why the properties probably seem somewhat pointless to you. Don't worry about their "relevance" for now; just make sure you can keep the properties straight so you can pass the next test. The lesson below explains how I kept track of the properties.
http://www.purplemath.com/modules/numbprop.htm
Teksten gir ingen eksempler og utelater å fordype videre. Jeg lurte på om det er noen her som kan påta seg denne oppgaven?
Takk,
nadeem.
Jeg har blitt lært opp til å tro at faktorenes orden er likegyldig. At 9*7 er det samme som 7*9.
Men nå kom jeg over en tekst som påstår at det faktisk finnes tilfeller der denne regelen ikke gjelder. Der faktorenes orden ikke er likegyldig. Dette får meg til å undre.
There are three basic properties of numbers, and you'll probably have just a little section on these properties, maybe at the beginning of the course, and then you'll probably never see them again (until the beginning of the next course). Covering these properties is a holdover from the "New Math" fiasco of the 1960s. While these properties will start to become relevant in matrix algebra and calculus (and become amazingly important in advanced math, a couple years after calculus), they really don't matter a whole lot now.
Why not? Because every math system you've ever worked with has obeyed these properties. You have never dealt with a system where a×b didn't equal b×a, for instance, or where (a×b)×c didn't equal a×(b×c). Which is why the properties probably seem somewhat pointless to you. Don't worry about their "relevance" for now; just make sure you can keep the properties straight so you can pass the next test. The lesson below explains how I kept track of the properties.
http://www.purplemath.com/modules/numbprop.htm
Teksten gir ingen eksempler og utelater å fordype videre. Jeg lurte på om det er noen her som kan påta seg denne oppgaven?
Takk,
nadeem.
