{{ option.label }} add
menu_book {{ printedBook.name}}
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arrow_left {{ state.menu.current.current.current.label }}
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ProdToSumFourTerms

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Teori

$4a

a+a+a+a4abetyderattdetfinns4styckena$:n. Det kan man skriva som en summa, t.ex.
4⋅5y=5y+5y+5y+5y.
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