Question

O valor da expressão
$( \frac{1}{2} ) + ( \frac{3}{4} ) - ( \frac{2}{5} )$
é:

$\frac{1}{2}$
$\frac{6}{11}$
$\frac{33}{20}$
$\frac{27}{30}$
$\frac{17}{20}$

​

Answer 1

Resposta:

$\frac{17}{20}$

Explicação:

(1/2)+(3/4)-(2/5) =

[(20÷2×1)+(20÷4×3)-(20÷5×2)]/20 =

[(10×1)+(5×3)-(4×2)]/20 =

[10+15-8]/20 =

[25-8]/20 =

17/20