Réponse :
Bonjour!
A = 30(1+2a) B = 90(7+a) C = 5(8-a) D = 2a-2b
E = 400-4a F = 20b-10a G = 5a H = 6a+5ab
Explications étape par étape :
A = 5*6 + 5*12a B = 45(14+2a) C = 40-5a D = 2(a-b)
A = 5*6*1 + 5*6*2a B = 45(2*7+2*a) C = 5*8-5*a D = 2*a-2*b
A = 5*6(1+2a) B = 45*2(7+a) C = 5(8-a) D = 2a-2b
A = 30(1+2a) B = 90(7+a)
E = (100-a)*4 F = 10*(2b-a) G = 2a+3a H = a(6+5b)
E = 100*4-a*4 F = 10*2b-10*a G = (2+3)a H = a*6+a*5b
E = 400-4a F = 20b-10a G = 5a H = 6a+5ab
