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Övningar

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Teori

$(\pm a)^2

a^2 $=$ \pm 3 $b e s k r i v e r t v \overset{a}{˚} o l i k a t a l s a m t i d i g t : b \overset{a}{˚} d e 3 o c h$ \text{-} 3. $O a v s e t t v i l k e t a v t a l e n v i t a r i k v a d r a t k o m m e r v i a t t f \overset{a}{˚} d e n^{'''} p o s i t i v a^{'''} p r o d u k t e n$ 3^23^2=9$ i slutet, eftersom "minus gånger minus blir plus".

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Teori

$(\pm a)^2