Question

alguém me ajuda pfvr????? urgente​

Answer 1

Explicação passo-a-passo:

2.a)

$\frac{4 }{14} = \frac{x}{21} \\ x = \frac{84}{14} = 6$

$\frac{4}{10} = \frac{6}{y} \\ y = \frac{60}{4} = 15$

2.b)

$\frac{4}{13} = \frac{x}{26} \\ x = \frac{4 \times 26}{13} = 4 \times 2 = 8$

$\frac{4}{9} = \frac{8}{y} \\ y = \frac{9 \times 8}{4} = 9 \times 2 = 18$

3.a)

$\frac{x}{x + 2} = \frac{9}{12} \\ 12x = (x + 2) \times 9 \\ 12x = 9x + 18 \\ 12x - 9x = 18 \\ 3x = 18 \\ x = \frac{18}{3} = 6$