Question

qual é o valor das expressões
2-[1/4-(3/5-5)]
1/3-[2/5-(3/2-7/15)]+7/10

Answer 1

$2 - [ \frac{1}{4} -( \frac{3}{5}-5)] \\ \\ =2-[ \frac{1}{4} -( \frac{3-25}{5} )] \\ \\ =2-[ \frac{1}{4} -( -\frac{22}{5}) \\ \\ =2-[ \frac{1}{4}+ \frac{22}{5} ] \\ \\ =2-[ \frac{5+88}{20}] \\ \\ =2- \frac{93}{20} \\ \\ = \frac{40-93}{20}$
 
                                                                $- \frac{53}{20}$ RESULTADO FINAL


$\frac{1}{3} -[ \frac{2}{5} -( \frac{3}{2} - \frac{7}{15} )]+ \frac{7}{10} \\ \\ = \frac{1}{3} -[ \frac{2}{5} -( \frac{45-14}{30})]+ \frac{7}{10} \\ \\= \frac{1}{3} -[ \frac{2}{5} - \frac{31}{30} ]+ \frac{7}{10} \\ \\ = \frac{1}{3} -[ \frac{12-31}{30} ]+ \frac{7}{10} \\ \\ = \frac{1}{3} -[- \frac{19}{30} ]+ \frac{7}{10} \\ \\ = \frac{1}{3} + \frac{19}{30} + \frac{7}{10} \\ \\ = \frac{10+19+21}{30}$
 
$= \frac{50}{30}$
 
                                                                  $\frac{5}{3}$  RESULTADO FINAL