Question

1 - Qual o valor da expressão
-1/2+1/4? a)+2/6 b)-2/6 c)-1/4 d)+1/4

Answer 1

$\dfrac{1}{4} - \dfrac{1}{2}$

Devemos igualar o denominador da nossa expressão:

$\dfrac{1}{4} - \dfrac{2}{2}\cdot\dfrac{1}{2}\\\\\\\dfrac{1}{4} - \dfrac{2}{4}\\\\\\\dfrac{1-2}{4}\\\\\\\boxed{-\dfrac{1}{4}}$

Letra c