October 2020 0 59 Report
Bonjour, pouvez vous me dire si cela est bon : A = (5x+3)(-2x-7)-(5x+3)² . Calculer x = -3 donc A=(5*-3+3)(-2*-3-7)-(5*-3+3)² A=(-15+3)(6-7)-(-15+3)²
A = -90-105+18-21-15²+2*-15*3-3²
A=12²-102

B= x= 4/5
B= (9*4/5+2)(9*4/5-2)+(9*4/5-2)(4*4/5+6)
B=(7.2+2)(7.2-2)+(7.2-2)(3.2+6)
B = 51.84-4+23.04+43.2-6.4+12

Merci d'avance
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