Question

1-) Sendo A = 1/3 - 1/5 e B = 2/3 - 3/4 calcule:

a) A + B =
b) B - A =
c) A - B =
d) A . B =
e) A : B =
f) B : A =

Answer 1

Resposta:

Explicação passo a passo:
A = 1/3 - 1/5 Mmc 3, 5 = 15
15:3=5.1 = 5 5/15 - 3/15 = 2/15
15:5=3.1 = 3 A = 2/15

B = 2/3 - 3/4 = Mmc 3, 4 = 12
12:3 = 4x2 = 8 -
12:4 = 3x3 = 9
B = 8/12 - 9/12 = - 9/12
B = - 9/12
a) A+B = 2/15 - 9/12 Mmc 15, 12 = 60
8/60 - 45/60 = - 37/60
b) B - A = -45/60 - 8/60 = - 53/60
c) A - B = 8/60 + 45/60 = 53/60
d) A: B = 2/15 x (-12/9) = -24/135
e) B : A = - 9/12 x 15/2 = - 135/24