Question

Calcule x:
A)x-2/x=12/20
B)0,6/2x=0,9/6
C)x+1/x=1/3
D)5/x+3=2/7,3

Answer 1

Olá, tudo bem?

$a)\,\,\dfrac{x-2}{x}=\dfrac{12}{20}\rightarrow 20(x-2)=12x\rightarrow\\\\ 20x-40=12x\rightarrow 8x=40\rightarrow \boxed{x=5}$

$b)\,\,\dfrac{0,6}{2x}=\dfrac{0,9}{6}\rightarrow 1,8x=3,6\rightarrow \boxed{x=2}$

$c)\,\,\dfrac{x+1}{x}=\dfrac{1}{3}\rightarrow 3(x+1)=x\rightarrow\\\\3x+3=x\rightarrow 2x=-3\rightarrow \boxed{x=-\dfrac{3}{2}}$

$d)\,\,\dfrac{5}{x+3}=\dfrac{2}{7,3}\rightarrow 2(x+3)=5\times 7,3\rightarrow \\\\ 2x+6=36,5\rightarrow 2x=30,5\rightarrow \boxed{x=15,25}$

Qualquer dúvida, por favor, é só me comunicar, ok? Muito Agradecido!!