Transformation, simplification d'écritures
31 On considère le modèle suivant :
3 x (x + 2) = 3 × x + 3 x 2 = 3 x x + 6
Transformer de façon analogue :
a) 8 x (x + 7)
c) 9 x (5 + m)
e) 7 x (6 + a)
b) 7 x (x + y)
d) x x (2-y)
f) 9 × (7-x)
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