68 Développer et réduire chaque expression. Tester chaque résultat en prenant x = 1.
A= x (x - 5) - 2 (3 + x);
B=-3x (2x + 4) - X(2 - 3x):
C=-3 (x2 + 7) + (6x - 1) - x (15 + 7x) - 3.
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