Question

a. 6/7 - [2-1/5] =?
b. 1/3+4/5-2/4 =?

Answer 1

a)

$\dfrac{6}{7} - 2 - \dfrac{1}{5} \\ \\ \\ \dfrac{6}{7} - \dfrac{2.5 - 1}{5} \\ \\ \\ \dfrac{6}{7} - \dfrac{9}{5} \\ \\ \\ MMC ~de ~7, 5 = 35 \\ \\ \\ \dfrac{5.6 - 7 . 9}{35} \\ \\ \\ \dfrac{30 - 63}{35} \\ \\ \\ =\ \textgreater \ -\dfrac{33}{35}$

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b)

$\dfrac{1}{3} + \dfrac{4}{5} - \dfrac{2}{4} \\ \\ \\ \dfrac{1}{3} + \dfrac{3}{10} \\ \\ \\ =\ \textgreater \ \dfrac{19}{30}$