: On considère les expressions A, B et C suivantes :
A = (3 x – 1)( x – 3) ;
B = 2 x(3 x – 1) – (5 x 2 – 3 x) ;
C = - (-3x + 2) – 2 x
1) Développer et réduire A, B et C.
2) Calculer A, B et C pour x = - 2.
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