CALCUL MENTAL Développement-FactorisationEntrainement Collège F Mauriac.

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CALCUL MENTAL Développement-FactorisationEntrainement Collège F Mauriac

Calculez! 1 er calcul 93 x x 18

Calculez! 2 eme calcul 2 eme calcul 2 eme calcul 15 x 102 – 15 x 2

Calculez! 3 eme calcul 3 eme calcul 3 eme calcul 103 x 15

Calculez! 4 eme calcul 4 eme calcul 4 eme calcul 99 x 13

Calculez! 5 eme calcul 5 eme calcul 5 eme calcul 6,5 x 12 – 3,5 x 12

Simplifiez! 6 eme calcul 6 eme calcul 6 eme calcul 3 x a + 2 x b

Simplifiez! 7 eme calcul 7 eme calcul 7 eme calcul 5 x a x 7

Développer et réduire! 8 eme calcul 8 eme calcul 8 eme calcul 3 x (a + 4)

Développer et réduire! 9 eme calcul 9 eme calcul 9 eme calcul (b – 8) x 2

Factorisez! 10 eme calcul 5 x a – 35

Correction

Calculez! 1 er calcul 93 x x 18 =(93 + 7) x 18 =100 x 18 =1800

Calculez! 2 eme calcul 2 eme calcul 2 eme calcul 15 x 102 – 15 x 2 = 15 x (102 – 2) = 15 x 100 = 1500

Calculez! 3 eme calcul 3 eme calcul 3 eme calcul 103 x 15 =(100+3) x 15 =100 x x 15 = = 1545

Calculez! 4 eme calcul 4 eme calcul 4 eme calcul 99 x 13 = (100 – 1) x 13 = 100 x 13 – 1 x 13 = 1300 – 13 = 1287

Calculez! 5 eme calcul 5 eme calcul 5 eme calcul 6,5 x 12 – 3,5 x 12 = (6,5 – 3,5) x 12 = 3 x 12 = 36

Simplifiez! 6 eme calcul 6 eme calcul 6 eme calcul 3 x a + 2 x b = 3a + 2b

Simplifiez! 7 eme calcul 7 eme calcul 7 eme calcul 5 x a x 7 = 5 x 7 x a = 35a

Développer et réduire! 8 eme calcul 8 eme calcul 8 eme calcul 3 x (a + 4) = 3 x a + 3 x 4 = 3a + 12

Développer et réduire! 9 eme calcul 9 eme calcul 9 eme calcul (b – 8) x 2 = 2 x b – 2 x 8 = 2b – 16

Factorisez! 10 eme calcul 5 x a – 35 = 5 x a – 5 x 7 = 5 (a – 7)