Question

Descubra o valor de x
pfv alguem ajuda

Answer 1

Explicação passo-a-passo:

c)

$\sf \frac{15}{6}=\frac{x}{5}$

$\sf 6x =75$

$\sf x = \frac{75}{6} =>\frac{25}{2}$

d)

$\frac{3x+1}{5x-1} =\frac{4}{6}$

$\sf 4(5x-1)=6(3x+1)$

$\sf 20x - 4=18x +6$

$\sf 20x -18x =6+4$

$\sf 2x = 10$

$\sf x=\frac{10}{2}$

$\sf x=5$

e)

$\sf \frac{8}{x} =\frac{10}{2}$

$\sf 10x =16$

$\sf x=\frac{16}{10}=>\frac{8}{5}$

Espero ter ajudado !!!

Answer 2

Explicação passo-a-passo:

c) Pelo Teorema de Tales:

$\sf \dfrac{x}{5}=\dfrac{15}{6}$

$\sf 6x=5\cdot15$

$\sf 6x=75$

$\sf x=\dfrac{75}{6}$

$\sf \red{x=12,5}$

d) Pelo Teorema de Tales:

$\sf \dfrac{3x+1}{5x-1}=\dfrac{4}{6}$

$\sf 4\cdot(5x-1)=6\cdot(3x+1)$

$\sf 20x-4=18x+6$

$\sf 20x-18x=6+4$

$\sf 2x=10$

$\sf x=\dfrac{10}{2}$

$\sf \red{x=5}$

e) Pelo Teorema de Tales:

$\sf \dfrac{x}{2}=\dfrac{8}{10}$

$\sf 10x=2\cdot8$

$\sf 10x=16$

$\sf x=\dfrac{16}{10}$

$\sf \red{x=1,6}$