Effectuer les calculs A et B en détaillant les étapes de calcul. Pour C et D, développer A = 2 + (3 - 7 ) x ( 6 - 2 )
B = - 4 : ( - 2 ) + ( - 5 - 2 )

C = ( 2x + 1 ) ( x - 7 )
D = - 5 ( x - 2 ) + ( x - 8 ) + 2 ( x - 1 )
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