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:
[tex]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}\\\\[/tex]
[tex]i)\dfrac{7}{9} -\dfrac{1}{6} \\\\\\mmc~=~18\\\\\\=\dfrac{(7.2)-(1.3)}{18} \\\\\\=\dfrac{14-3}{18} \\\\\\Resposta~=~+\dfrac{11}{18} \\\\[/tex]
[tex]j)\dfrac{9}{10} -\dfrac{3}{10} -\dfrac{5}{10} \\\\\\Bases~iguais:\\\\\\=\dfrac{(9-3-5)}{10} \\\\\\Resposta~=~+\dfrac{1}{10}\\\\[/tex]
[tex]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} \\\\[/tex]
Para saber mais acesse os links abaixo
Frações
https://brainly.com.br/tarefa/40094173
https://brainly.com.br/tarefa/40070904
