Question

Calcule as expressões numéricas abaixo:
7/5 - 5/9=
5/4 +3/4-1/4=
2/4+2/3=
3/5-2/7=

Answer 1

$\frac{7}{5} - \frac{5}{9} = \frac{63-25}{45} = \frac{38}{45}$

$\frac{5}{4} + \frac{3}{4} - \frac{1}{4} = \frac{5+3-1}{4} = \frac{7}{4}$

$\frac{2}{4} + \frac{2}{3} = \frac{7}{6}$

$\frac{3}{5} - \frac{2}{7} = \frac{11}{35}$


espero ter ajudado...