Question

o valor da seguinte expressão numérica 2/5-1/10+0,2

a)7/10

b)1/2

c)3/10

d)23/10​

Answer 1

$\sf = \frac{2}{5} - \frac{1}{10} + 0.2$

$\sf = \frac{2}{ 5} - \frac{1}{10} + \frac{2}{10}$

$\sf = \frac{2}{ 5} - \frac{1}{10} + \frac{1}{5}$

$\sf = \frac{4 - 1 + 2}{10}$

$\sf = \frac{5}{10}$

$\sf  \color{green}{ = \frac{1}{2} }$

❑Alternativa: B