Question

o valor da expressao numerica 2/5-3/4x1/2+(4,2)

Answer 1

2/5 - 3/4 × 1/2 + 42/100
2/5 - 3/8 + 42/100
80/200 - 75/200 + 84/200
89/200

Answer 2

Olá thamaranaely5931 ! ☺

Bem, siga o passo a passo da resolução abaixo:

$\displaystyle \mathsf {\dfrac {2}{5} - \dfrac {3}{4} \cdot \dfrac {1}{2} + \dfrac {42}{100}}$

$\displaystyle \mathsf {\dfrac {2}{5} - \dfrac {3}{8} + \dfrac {42}{100}}$

$\displaystyle \mathsf {\dfrac {80}{200} - \dfrac {75}{200} + \dfrac {84}{200}}$

$\displaystyle \mathsf {\dfrac {89}{200}}$