Question

Sobre Operações de Frações

1) Efetue as operações:

a) 2 - 2 /5
b) 2 : 2 /5
c) 1 /2 + 1 /4 + 1 / 5
d) 1/2 x 1 /4 x 1 /5

Answer 1

a)

$\mathsf{2-\dfrac{2}{5}=\dfrac{10-2}{5}=\dfrac{8}{5}}$

b)

$\mathsf{2\div\dfrac{2}{5}=2\times\dfrac{5}{2}=5}$

c)

$\mathsf{\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{5}=\dfrac{10+5+4}{20}=\dfrac{19}{20}}$

d)

$\mathsf{\dfrac{1}{2}\times\dfrac{1}{4}\times\dfrac{1}{5}=\dfrac{1}{40}}$