Question

calcular as expressões, efetuando -se primeiramente entre os parênteses:
a) 7/4 - (1/2+1/6+1/3)=

Answer 1

$\frac{7}{4} -( \frac{1}{2} + \frac{1}{6} + \frac{1}{3} )= \\ \\ \frac{7}{4} -( \frac{3+1+2}{6} )= \\ \\ \frac{7}{4} -( \frac{6}{6} )= \\ \\ \frac{7}{4} -1= \\ \\ \frac{7-4}{4} = \frac{3}{4}$