Developement & factorisations
1.sans poser d'operations
Completer:
13x22=13x(20+___ ) =13x20+13x ____ =____ + _____ = _____
Sur ce modele, calculer les produits suivants :
13 x 35 = 13 x (30+ ____ ) = ___________________________________
24 x 102=24 x (100+ _____ )= ___________________________________
2.Mise en facteur
Completer:
2 x 734 + 8 x 734 = ( _____ + _____ ) x 734 = ____ x 734 = ______________
Sur ce modèle, calculer:
57 x 25 + 43 x 25 = ___________________________________
113 x 28 - 13 x 28 = ____________________________________
4.Reduire les Expressions
11a - 8a + 5a - 2a = _________________________
15a - 3 + 7a + 4 - 8a = _____________________________
6a - (8a - 2 ) + (4a - 3 ) = _______________________________
5.Factoriser les expressions
7 x 2 + 7m = ______________________________________
7,2 x 5 - 5 n = ______________________________________
2,3 a + 2,3 b - 2,3 c = _________________________________
Merci de m'aider!
13 x 35 = 13 x (30 +5) = 13 x 30 + 13 x 5 = 390 + 65 = 455
24 x 102 = 24 x (100 +2) = 24 x 100 + 24 x 2 = 2400 +48 = 2 448
2) 57 x 25 +43 x 25 = (57 +43) x 25 = 100 x 25 = 2500
113 x 28 -13 x 28 = (113 -13) x 28 = 100 x 28 = 2800
4) 11a -8a+5a-2a = 16a -10a = 6a
15a-3+7a+4-8a = 22a-8a+4 = 14a+4
6a-(8a-2) +(4a-3)
= 6a-8a+2+4a-3 = 2a-1
5) 7 x 2+7m = 14 + 7m = 7(2 +m)
7.2 x 5 -5n = es tu sûre du 7.2 ?
2.3a +2.3b-2.3c = 2.3(a+b-c)
