Réponse:
exercice 16:
5×a + 5×9 = 5a+45
3×b - 3×4 =3b-12
Bonsoir
5×a+5×9=5a+45
3×b-3×4=3b-12
40+8x+3=8x+43
28-7y+9=-7y+37
10+5z+3z+3=8z+13
5t+5t(au carré)+t(au carré)-2t=6t(au carré)+3t
