Question

a) ( 4 sobre 5 ) + ( 4 sobre 9) b) ( 3 sobre 4 ) + ( 7 sobre 12) c) ( 7 sobre 8) - ( 5 sobre 9)

Answer 1

Olá!

a) $\frac{4}{5} + \frac{4}{9} = \frac{36}{45} + \frac{20}{45} = \frac{65}{45} = \frac{13}{9}$

b)$\frac{3}{4} + \frac{7}{12} = \frac{9}{12} + \frac{7}{12} = \frac{16}{12} = \frac{8}{6} = \frac{4}{3}$

c)$\frac{7}{8} - \frac{5}{9} = \frac{63}{72} - \frac{40}{72} = \frac{23}{72}$