developper et reduire
A= 3b+5(a+b)-4(2b-a)
B= (3a-7)(5-2a)
A = 3b + 5a + 5b - 8b + 4a
A = 9a
B = 15a - 6a - 35 + 14a
B = 23a - 35
Rebonsoir
A = 3b+5(a+b)-4(2b-a)
A = 3b+5a+5b-8b+4a
A = 9a +8b -8b
B = (3a-7)(5-2a)
B = 15a-6a²-35+14a
B = -6a²+29a-35
