Question

10
1)
Qual fração representa a simplificação de
b. (1)
a. ( )
a
2)
Calcule:
a);
b)
c)
15
15
3)
Realize a simplificação e obtenha a fração irredutível em cada item.
20
a)
30
b)​

Answer 1

Explicação passo-a-passo:

1)

$\sf \dfrac{8}{10}=\dfrac{8\div2}{10\div2}=\red{\dfrac{4}{5}}$

2)

a)

$\sf \dfrac{1}{5}+\dfrac{3}{5}=\dfrac{1+3}{5}=\red{\dfrac{4}{5}}$

b)

$\sf \dfrac{5}{10}-\dfrac{2}{10}=\dfrac{5-2}{10}=\red{\dfrac{3}{10}}$

c)

$\sf \dfrac{8}{15}-\dfrac{1}{15}+\dfrac{13}{15}$

$\sf =\dfrac{8-1+13}{15}$

$\sf =\dfrac{20}{15}$

$\sf =\dfrac{20\div5}{15\div5}$

$\sf =\red{\dfrac{4}{3}}$

d) $\sf mmc(6,3)=6$

$\sf \dfrac{4}{6}+\dfrac{2}{3}$

$\sf =\dfrac{4\cdot1+2\cdot2}{6}$

$\sf =\dfrac{4+4}{6}=\dfrac{8}{6}$

$\sf =\dfrac{8\div2}{6\div2}$

$\sf =\red{\dfrac{4}{3}}$

3)

a) $\sf \dfrac{20}{30}=\dfrac{20\div10}{30\div10}=\red{\dfrac{2}{3}}$

b) $\sf \dfrac{7}{21}=\dfrac{7\div7}{21\div7}=\red{\dfrac{1}{3}}$

c) $\sf \dfrac{5}{10}=\dfrac{5\div5}{10\div5}=\red{\dfrac{1}{2}}$

4)

a) $\sf \dfrac{2}{6}=\dfrac{2\cdot2}{6\cdot2}=\red{\dfrac{4}{12}}$

b) $\sf \dfrac{13}{100}=\dfrac{13\cdot2}{100\cdot2}=\red{\dfrac{26}{200}}$