Lær hvordan du lægger sammen og trækker fra med negative tal. De opgaver, der er løses i denne video, er 2-3 = - 1 og -2-3 = - 5 og -2 + 3 = 1 og 2 - (-3) = 5 og -2 - (-3). Lavet af Sal Khan.
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- hvad er 30 plus 1(1 stemme)
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