livro de matematica teoria e contexto 7 ano pagina 88 numero 8
Anônimo:
Adriele, que tal deixar a preguiça de lado e escrever o exercício de interesse para que possamos ajuda-la.
pense nas operaçoes e suas inversas e calcule o valor do numero racional x . a) 3 . x = 5 b) x/8=3/2
c) x : 5/7=4/5
d) x + 7/12 =1/8
Adriele, o exercicio c x esta dividindo 5/7.
sim
OK!
responda tambem esta aq pq
d) - 1/20: (2/1 - 3/5)
Respostas
respondido por:
7
Boa noite!
Solução!
A)
![3x=5\\\\\
\boxed{x= \dfrac{5}{3}}](https://tex.z-dn.net/?f=3x%3D5%5C%5C%5C%5C%5C%0A%5Cboxed%7Bx%3D+%5Cdfrac%7B5%7D%7B3%7D%7D+ "3x=5\\\\\
\boxed{x= \dfrac{5}{3}}")
B)
![\dfrac{x}{8}= \dfrac{3}{2}\\\\\\
2x=24\\\\\\
x= \dfrac{24}{2}\\\\\
\boxed{x=12}](https://tex.z-dn.net/?f=+%5Cdfrac%7Bx%7D%7B8%7D%3D+%5Cdfrac%7B3%7D%7B2%7D%5C%5C%5C%5C%5C%5C%0A2x%3D24%5C%5C%5C%5C%5C%5C%0Ax%3D+%5Cdfrac%7B24%7D%7B2%7D%5C%5C%5C%5C%5C%0A%5Cboxed%7Bx%3D12%7D+++ "\dfrac{x}{8}= \dfrac{3}{2}\\\\\\
2x=24\\\\\\
x= \dfrac{24}{2}\\\\\
\boxed{x=12}")
C)
![\dfrac{x}{ \dfrac{5}{7} }= \dfrac{4}{5}\\\\\\
\dfrac{7x}{5}= \dfrac{4}{5}\\\\\
35x=20\\\\\\
x= \dfrac{20}{35}\\\\\\
Simplificando!\\\\\\
\boxed{x= \dfrac{4}{7}}](https://tex.z-dn.net/?f=+%5Cdfrac%7Bx%7D%7B+%5Cdfrac%7B5%7D%7B7%7D+%7D%3D+%5Cdfrac%7B4%7D%7B5%7D%5C%5C%5C%5C%5C%5C%0A+%5Cdfrac%7B7x%7D%7B5%7D%3D+%5Cdfrac%7B4%7D%7B5%7D%5C%5C%5C%5C%5C%0A35x%3D20%5C%5C%5C%5C%5C%5C%0Ax%3D+%5Cdfrac%7B20%7D%7B35%7D%5C%5C%5C%5C%5C%5C%0ASimplificando%21%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bx%3D+%5Cdfrac%7B4%7D%7B7%7D%7D++++++ "\dfrac{x}{ \dfrac{5}{7} }= \dfrac{4}{5}\\\\\\
\dfrac{7x}{5}= \dfrac{4}{5}\\\\\
35x=20\\\\\\
x= \dfrac{20}{35}\\\\\\
Simplificando!\\\\\\
\boxed{x= \dfrac{4}{7}}")
D)
![x+ \dfrac{7}{12}= \dfrac{1}{8}\\\\\\
24x+14=3\\\\\\
24x=3-14\\\\\\
24x=-11\\\\\
\boxed{x= -\dfrac{11}{14} }](https://tex.z-dn.net/?f=x%2B+%5Cdfrac%7B7%7D%7B12%7D%3D+%5Cdfrac%7B1%7D%7B8%7D%5C%5C%5C%5C%5C%5C%0A24x%2B14%3D3%5C%5C%5C%5C%5C%5C%0A24x%3D3-14%5C%5C%5C%5C%5C%5C%0A24x%3D-11%5C%5C%5C%5C%5C%0A%5Cboxed%7Bx%3D+-%5Cdfrac%7B11%7D%7B14%7D+%7D++ "x+ \dfrac{7}{12}= \dfrac{1}{8}\\\\\\
24x+14=3\\\\\\
24x=3-14\\\\\\
24x=-11\\\\\
\boxed{x= -\dfrac{11}{14} }")
Boa noite!
Bons estudos!
Solução!
A)
B)
C)
D)
Boa noite!
Bons estudos!
muito obrigado
respondido por:
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Resposta:
_18_3^(($$! ¥943×837)?'^@006÷("^$!
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