Olá

[tex]\LARGE{}( \frac{3}{4} - \frac{7}{16} ) + ( \frac{7}{8} + \frac{1}{4} ) \\ \\ \LARGE{} \frac{5}{16} + \frac{9}{8} \\ \\ \LARGE{} \frac{5 + 18}{16} \\ \\ \LARGE{}\LARGE\boxed{ \frac{23}{16} }[/tex]

[tex]{\large\boxed{\boxed{  { \large \tt BONS \: \: ESTUDOS \: MEU \: ANJO \:<3 }}}}[/tex]

Resposta:

[tex](\dfrac{3}{4}-\dfrac{7}{16})+(\dfrac{7}{8}+\dfrac{1}{4})=\\ \\ \\ (\dfrac{12-7}{16})+(\dfrac{7+2}{8})=\\ \\\\ \dfrac{5}{16}+\dfrac{9}{8}=\dfrac{5+18}{16}=\boxed{\dfrac{23}{16}}[/tex]