Exercice 6-7 • Développer et réduire les expressions suivantes : (a) A = (2x+8) (3x - 2) + 4(9-x) (b) B = 3x[(x + 1)(x - 2) + (4x - 1)(-2x - 1)] (c) C = (4y + 3)(1-t) - 2(t+9) (y + 1) (d) D = (e) E= (42-8)(z+3)(3-2z) 4 ¹-3) ( ²7- 2 9 X svp​
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