01c

  • October 2019
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RACÓ DE LES MATEMÀTIQUES

C O R R E C C I Ó

Qüestionari 01 1. Ordena de major a menor els nombres enters: (+3), (-4), (-1), (+5), 0, (+1), (-7). (+5) > (+3) > (+1) > 0 > (-1) > (-4) > (-7) 2. En aquesta llista de nombres enters, substitueix les comes que separen els nombres pel signe “major que” o “menor que”, segons correspongui (no els canviïs d'ordre!): (+5), (-3), (+3), (-2), (-4), 0, (+1), (-5). (+5) > (-3) < (+3) > (-2) > (-4) < 0 < (+1) > (-5) 3. Escriu l'oposat de cadascun d'aquests enters: (+3), -(6), (-4), (+2). op (+3) = (-3), op (-6) = (+6), op (-4) = (+4), op (+2) = (-2) 4. Fes aquestes sumes d'enters: a) (+3) + (-5) + (+2) = a) (+3) + (-5) + (+2) = (-2) + (+2) = 0 b) (-4) + (+3) + (-1) + (-6) = (-1) + (-1)

b)

(-4) + (+3) + (-1) + (-6) =

+ (-6) = (-2) + (-6) = (-8)

5. Resol aquestes restes de nombres enters: a) (+6) - (-4) =

b)

(-3) - (+2) =

a) (+6) - (-4) = (+6) + op (-4) = (+6) + (+4) = (+10) b) (-3) - (+2) = (-3) + op (+2) = (-3) + (-2) = (-5)

6. Calcula el resultat d'aquestes operacions combinades: a) (+3) - (-4) + (-2) - (+6) = b) (+1) - (-3) - (+6) + (-2) = c) (-4) + [(+1) - (-3)] - (+5) = d) [(+2) - (-5)] - [(-3) + (+1)] = a) (+3)-(-4) + (-2) - (+6)= (+3) + op(-4) + (-2) + op(+6)= (+3) + (+4) + (-2) + (-6)= (-1) b) (+1)-(-3) - (+6) + (-2)= (+1) + op(-3) + op(+6) + (-2)= (+1) + (+3) + (-6) + (-2)= (-4) c) (-4) + [(+1) - (-3)] - (+5)= (-4) + [(+1) + op(-3)] - (+5)= (-4) + [(+1) + (+3)] - (+5)=

(-4) + (+4) + op(+5) = (-4) + (+4) + (-5) = (-5) d) [(+2) - (-5)] - [(-3) + (+1)] = [(+2) + op(-5)] - (-2) = [(+2) + (+5)] - (-2) = (+7) + op (-2) = (+7) + (+2) = (+9) 7. El dia de Nadal de l'any passat, a Estocolm la temperatura mínima va ser de 12 graus sota zero. La màxima del dia va arribar fins als 5 graus positius. Quina diferència de temperatures hi va haver al llarg del dia? Mínima = (-12); màxima = (+5). Diferència = (+5) - (-12) = (+5) + op(-12) = (+5) + (+12) = (+17). Resposta: La diferència de temperatures va ser de 17º C.

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