Question

9. Aplicando a propriedade fundamental, resolver as proporções:

Answer 1

Explicação passo-a-passo:

$a) \: \: \frac{20}{25} = \frac{8}{x}$

$20x = 25.8 \\ 20x = 200 \\ x = \frac{200}{20}$

$x = 10$

$b) \: \: \frac{ \frac{3}{4} }{2x} = \frac{ \frac{1}{5} }{ \frac{1}{2} }$

$\frac{2x}{5} = \frac{6}{4}$

$4.2x = 6.5$

$8x = 30 \\ x = \frac{30}{8}$

$x = \frac{15}{4}$

$c) \: \: \frac{x + 3}{x + 1} = \frac{3}{5}$

5.(x +3)=3.(x+1)

5x+15=3x+3

5x-3x=3-15

2x= -12

x= -12/2

x= -6