Question

Calcule as frações abaixo:

Answer 1

A-

$\frac{12}{5} + \frac{10}{3}$

12 x 3 = 36

10 x 5 = 50

5 x 3 = 15

$\frac{36 + 50}{15}$

36 + 50 = 86

$\frac{86}{15}$

B-

$\frac{9}{ - 2} - \frac{18}{5}$

$- \frac{9}{2} - \frac{18}{5}$

9 x 5 = 45

18 x 2 = 36

2 x 5 = 10

$- \frac{45 + 36}{10}$

45 + 36 = 81

$- \frac{81}{10}$

C-

$\frac{21}{3} \div \frac{7}{6}$

$\frac{21}{3} \div \frac{6}{7}$

21 ÷ 3 = 7

$7 \times \frac{6}{7}$

6

D-

$\frac{14}{5} \times \frac{( - 3)}{4}$

$- \frac{14}{5} \times \frac{3}{4}$

14 ÷ 2 = 7

4 ÷ 2 = 2

$- \frac{7}{5} \times \frac{3}{2}$

7 x 3 = 21

5 x 2 = 10

$- \frac{21}{10}$

E-

$\frac{ - 3}{4} - \frac{( - 2)}{5}$

$\frac{ - 3}{4} + \frac{2}{5}$

- 3 x 5 = - 15

2 x 4 = 8

4 x 5 = 20

$\frac{ - 15 + 8}{20}$

- 15 + 8 = - 7

$\frac{ - 7}{20}$

F-

$\frac{1}{ - 5} \times \frac{3}{ - 4}$

$\frac{1}{5} \times \frac{3}{4}$

1 x 3 = 3

5 x 4 = 20

$\frac{3}{20}$