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Activitat Naturals

Els nombres naturals són:

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5 x 1 = 5

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5 x (4 - 2) = 5 x 4 - 5 x 2

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5 + (3 + 1) = (5 + 3) + 1

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6 x 5 = 5 x 6

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4 : (2+2) - 1

[3 - (9 - 7)] · 7 - 1