Réponse :
1) A= 3(x-5)+2(x-3)-4
A= 3*x-3*5+2*x-2*3-4
A= 3x-15+2x-6-4
A+ 5X2-25
2)
5*x2-5*5=5(x2-5)
3)
A= 3(1-5)+2(1-3)-4 A= 3(2-5)+2(2-3)-4
A= 3*(-4)+2*(-2) -4 A= 3*(-3)+2*(-1)-4
A= -12-4-4 A= -9-2-4
A= -20 A= -35