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$1

(\text{-}1)\cdot(\text{-}1)

= T a l e t

1

k a n s k r i v a s s o m e n [[P r o d u k t * W o r d l i s t * ∣ p r o d u k t]] a v f a k t o r e r n a

\text{-} 1

o c h

\text{-}1.$ Multipliceras två negativa tal blir ju produkten positiv och produkten av två ettor är alltid ett.

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