Question

1/4 - 2/10 =






??????????????????????????R:?

Answer 1

Resposta:

$\frac{1}{20}$

Explicação passo a passo:

$\frac{1}{4} - \frac{2}{10} = \frac{(40/4).1 + ((40/10).2}{40} = \frac{10 - 8}{40} = \frac{2}{40} = \frac{1}{20}$

Answer 2

h) +1/20

i) +11/8

j) +1/10

k) +77/40

Adição e subtração de frações

Temos que efetuar o MMC (Mínimo Múltiplo Comum), uma vez que temos que ter Denominadores iguais

Podemos fazer a simplificação quando possível.

Exercícios:

$h)~~\dfrac{1}{4} -\dfrac{2}{10} =\\\\\\Simplicando,~~ temos:\\\\\\\\\dfrac{1}{4} -\dfrac{1}{5} =\\\\\\mmc~=~20\\\\\\=\dfrac{(1.5)-(1.4)}{20} \\\\\\=\dfrac{5-4}{20} \\\\\\Resposta ~=~+\dfrac{1}{20}$

$i)\dfrac{7}{9} -\dfrac{1}{6} \\\\\\mmc~=~18\\\\\\=\dfrac{(7.2)-(1.3)}{18} \\\\\\=\dfrac{14-3}{18} \\\\\\Resposta~=~+\dfrac{11}{18}$

$j)\dfrac{9}{10} -\dfrac{3}{10} -\dfrac{5}{10} \\\\\\Bases~iguais:\\\\\\=\dfrac{(9-3-5)}{10} \\\\\\Resposta~=~+\dfrac{1}{10}$

$k)3-\dfrac{7}{8} -\dfrac{1}{5} =\\\\\\mmc~=~40\\\\\\\dfrac{(3.40)-(7.5)-(1.8)}{40} =\\\\\\=\dfrac{120-35-8}{40} \\\\\\=\dfrac{120-43}{40} \\\\\\Resposta~=~+\dfrac{77}{40}$

Para saber mais acesse os links abaixo

Frações

https://brainly.com.br/tarefa/40094173

https://brainly.com.br/tarefa/40070904