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Hvis man skal gange ind i en parantes skal man gange tallet man skal gange med med begge led/tal inde i parantesen dvs for eksempel:

2\cdot(2+3) =2\cdot2+2\cdot3 =4+6=10

Et andet eksempel:

3\cdot(10+6) =3\cdot10+3\cdot6 =30+18=48

Du kan også gange ind i parenteser, hvor du bruger bogstaver.

Eks.

a(a+b)=a^2+ab

b(x-b)=bx-b^2

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