Algebra, ligninger og uligheder Flashcards

1
Q

hvad er regnearternes hierki?

A
  1. parenteser
  2. x^2 og kvadratrod
  3. gange og division
  4. plus og minus
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2
Q

løs kvadratsætningen (a+b)^2

A

løsning= aa+bb+aba= a^2+b^2+2ab.

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3
Q

løs kvadratsætningen (a+b)*(a-b)

A

= a^2-b^2

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4
Q

(a-b)^2

A

a^2+b^2-2ab

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5
Q

plus parrenteser kan ophæves uden at ændre fortegn. f.eks. 2+(3+4)= 2+3+4. sandt eller falsk.

A

sandt.

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6
Q

minusparenteser kan man ophæve, hvis man ændre alle fortegn ind i parentesen. eks. 2-(3+4)= 2-3-4. sandt eller falsk

A

sandt

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