Question

3. Resolva: A) 3/5 - 7/9 = B) 2/7 + 4/3=​

Answer 1

Resposta:

A) 0.17777777

B) 1.61904761905

Answer 2

Letra a)

$\frac{3}{5} - \frac{7}{9} = \frac{ (3 \times 9) - (7 \times 5)}{45} = \frac{27 - 35}{45} = \frac{ - 8}{45}$

Letra b)

$\frac{2}{7} + \frac{4}{3} = \frac{(2 \times 3) + (4 \times 7)}{21} = \frac{6 + 28}{21} = \frac{ 34}{21}$