Question

1-efetue as adições e as subtrações
A)35/4-7/5
B)-18/3+49/7
C)-8/11-5/3
D)4/5+7/8


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Answer 1

a)

$\frac{35}{4} - \frac{7}{5}$

$\frac{35 \times 5 - 7 \times 4}{4 \times 5}$

$\frac{175 - 28}{20}$

$\frac{147}{20}$

b)

$- \frac{18}{3} + \frac{49}{7}$

$- 6 + 7$

$1$

c) - 8/11 - 5/3

$- \frac{8 \times 3 + 5 \times 11}{11 \times 3}$

$- \frac{24 + 55}{33}$

$- \frac{79}{33}$

d)

$\frac{4}{5} + \frac{7}{8}$

$\frac{4 \times 8 + 7 \times 5}{5 \times 2}$

$\frac{32 + 35}{40}$

$\frac{67}{40}$

Dúvidas?

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