Trekk sammen brøker
Posted: 30/11-2013 15:04
Hva gjør jeg feil????
[tex]2a(2/3 a-1/4 b)+3b(1/2 a-3a/9b)[/tex]
[tex]((4a^2)/3-2ab/4)+(3ab/2-9ab/9b)= ((12a^2)/12-6ab/12)+(18ab^2)/18b-18ab/18b (36a^2 b-18ab^2+36ab^2-36ab)/36b= (36a^2 b+18ab^2-36ab)/36b= a^2+1/2 ab-a[/tex]
Fasiten sier [tex](4/3)a^2+ab-a[/tex]
[tex]2a(2/3 a-1/4 b)+3b(1/2 a-3a/9b)[/tex]
[tex]((4a^2)/3-2ab/4)+(3ab/2-9ab/9b)= ((12a^2)/12-6ab/12)+(18ab^2)/18b-18ab/18b (36a^2 b-18ab^2+36ab^2-36ab)/36b= (36a^2 b+18ab^2-36ab)/36b= a^2+1/2 ab-a[/tex]
Fasiten sier [tex](4/3)a^2+ab-a[/tex]
