Réponse :
2) A = [tex]-3a + 13 = 10a[/tex]
B = [tex]-7a * 3a = 21[/tex][tex]a^{2}[/tex]
C = [tex]6*(-5a^{2} ) = 30a^{2}[/tex]
EXERCICE 3 :
A = [tex]2a = 5 (8-a)[/tex]
A = [tex]2a = 40 - 5a[/tex]
A = [tex]-3a + 40[/tex]
B = [tex]-8 (2a+5)-a[/tex]
B = [tex]-16a-40-a[/tex]
B = [tex]-17a-40[/tex]
C = [tex]2(5-4a) +3a *(-8+a)[/tex]
C = [tex]10-8a-24a+3a^{2}[/tex]
C = [tex]10-32a+3a^{2}[/tex]
D = [tex]5(1-9a)-a*(3a+7)[/tex]
D = [tex]5-45a-3a^{2} -7a[/tex]
D = [tex]5-52a-3a^{2}[/tex]
