Question

3-) Calcule a adição e a subtração de frações .

A) 7/12 + 5/12 =

B) 5/12 + 3/8 =

C) 21/23 - 13/23 =

D) 2/5 - 1/3 =​

Answer 1

A)

$\frac{7}{12} + \frac{5}{12} = \frac{19 + 17}{144} = \frac{36}{144}$

B)

$\frac{5}{12} + \frac{3}{8} = \frac{13 + 15}{96} = \frac{28}{96}$

C)

$\frac{21}{23} - \frac{13}{23} = \frac{483 - 299}{529} = \frac{ - 184}{529}$

D)

$\frac{2}{5} - \frac{1}{3} = \frac{6 - 5}{15} = \frac{1}{15}$