Question

Determine o valor de x nas proporções a seguir:

Por favor, me ajudem!​

Answer 1

$\sf{A)\,x=8}$

$\sf{B)\,x=3}$

Explicação passo-a-passo:

$\large\boxed{\begin{array}{l} \sf \: \dfrac{6}{x} = \dfrac{9}{12} \\ \\ \sf \: 9x = 12 \times 6 \\ \\ \sf \: 9x = 72 \\ \\ \sf{x = \dfrac{72}{9} } \\ \\ \boxed{ \boxed{ \boxed{ \sf{x = 8}}}}\end{array}}\large\boxed{\begin{array}{l} \sf \dfrac{3}{4} = \dfrac{5x}{20} \\ \\ \sf \: 20x = 20 \times 3 \\ \\ \sf \: 20x = 60 \\ \\ \sf \: x = \dfrac{60}{20} \\ \\ \boxed{ \boxed{ \boxed{ \sf{x = 3}}}}\end{array}}$

Answer 2

Explicação passo-a-passo:

A)

$\dfrac{6}{x} = \dfrac{9}{12}$

$9x = 6 \times 12$

$9x = 72$

$x = \dfrac{72}{9}$

x=>8

B)

$\dfrac{3}{4} = \dfrac{5x}{20}$

$4 \times 5x = 3 \times 20$

$20x = 60$

$x = \dfrac{60}{20}$

x=>3