Question

teorema de tales me ajudem, como faz e qual a resposta certa?

Answer 1

a)

$\frac{x}{4}=\frac{9}{18}\\\\\frac{x}{4}=\frac{1}{2}\\\\Multiplicando\;cruzado\\\\2.x=4\;.\;1\\\\x=\frac{4}{2}\\\\x=2$

b)

$\frac{10}{15}=\frac{3x+1}{5x-2}\\\\\frac{2}{3}=\frac{3x+1}{5x-2}\\\\Multiplicando\;cruzado:\\\\3.(3x+1)=2.(5x-2)\\\\9x+3=10x-4\\\\10x-9x=3+4\\\\x=7$