Question

determine o valor de X nas figuras:​

Answer 1

Resposta:

a)

$\frac{x}{4} = \frac{9}{12} \\ 12 \times x = 9 \times 4 \\ 12x = 36 \\ x = \frac{36}{12} \\ x = 3$

b)

$\frac{21}{x} = \frac{28 + 21}{63} \\ \frac{21}{x} = \frac{49}{63} \\ 49 \times x = 63 \times 21 \\ 49x = 1323 \\ x = \frac{1323}{49} \\ x = 27$