Question

por favor, é pra hoje, me ajudem.​

Answer 1

Resposta:

$a)\;\frac{1}{2} -\frac{1}{4} +\frac{1}{6} -3=\\\\(\frac{1}{2} -\frac{1}{4}) +(\frac{1}{6} -\frac{3}{1} )= \\\\(\frac{1.2}{2.2} -\frac{1}{4}) +(\frac{1}{6} -\frac{3.6}{1.6} )= \\\\(\frac{2}{4} -\frac{1}{4}) +(\frac{1}{6} -\frac{18}{6} )= \\\\(\frac{2-1}{4}) +(\frac{1-18}{6})= \\\\(\frac{1}{4}) +(-\frac{17}{6})= \\\\\frac{1}{4} -\frac{17}{6}=\\\\\frac{1.6 - 17.4}{4.6}= \\\\\ \frac{6-68}{24} = \\\\-\frac{62}{24} = - \frac{62^{:2}}{24^{:2}} = -\frac{31}{12}$

Portanto, a resposta é a primeira alternativa.