Respostas
Resposta:
3
Explicação passo-a-passo:
Utilizando o m.m.c :
a/2 + b/2 = a+b/2
(6)/2 =
3
Espero ter ajudado!
Resposta:
= 3
Explicação passo-a-passo:
A+b=6
a.b=4
a/2+b/2=?
a = 6 - b
a.b = 4
(6-b).b = 4
6b - b^2 = 4
- b^2 + 6b - 4 = 0 (-1)
b^2 - 6b + 4 = 0
a = 1; b = - 6; c = 4
/\= b^2 - 4ac
/\ = (-6)^2 - 4.1.4
/\= 36 - 16
/\= 20
\/ /\ = \/20 = \/4.\/5 = 2\/5
B = [-b +/- \/ /\] / 2a
B = [-(-6) +/- 2\/5] / 2.1
B = [6 +/- 2\/5] /2
B = [6/2 +/- 2\/5/2]
B' = 3+\/5
B" = 3 - \/5
B = (3+\/5)
a.b = 4
b.a = 4
(3+\/5).a = 4
a = 4/(3+\/5) . (3-\/5)/(3-\/5)
a = 4.(3-\/5)/(3+\/5).(3-\/5)
a = 4.(3-\/5)/(9-3\/5+3\/5-\/5.\/5)
a = 4.(3-\/5)/(9-5)
a = 4.(3-\/5)/4
a = (3 - \/5)
Se:
a = (3-\/5) ; b = (3+\/5)
a = (3+\/5) ; b = (3 - \/5)
B.a = 4
(3+\/5).(3-\/5)= 9- 3\/5+3\/5-5 = 4
a + b = 6
(3-\/5)+(3+\/5) = 3+3 = 6
a/2 + b/2
= (3-\/5)/2 + (3+\/5)/2
= (3-\/5+3+\/5)/2 = 6/2 = 3
R.: 3