Question

me ajudem por favor​

Answer 1

Resposta:

Usar o teorema de Tales

e)

$\dfrac{4}{12} = \dfrac{x}{21}$

$12x = 4\times 21\\12x = 84\\x = \dfrac{84}{12} \\\\x = 7$

f)

$\dfrac{x}{14} = \dfrac{9}{12}$

$12x = 9 \times 14\\12x = 126\\\\x = \dfrac{126}{12} \\\\x = 10,5$

g)

$\dfrac{x}{9} = \dfrac{8}{12}\\ \\12x = 8\times 9\\12x = 72\\\\x = \dfrac{72}{12} \\\\x = 6$

Explicação passo-a-passo: