Question

copie e complete
$\frac{3}{4} = \frac{9}{?} = \frac{?}{20} = \frac{30}{?} = \frac{?}{80}$

Answer 1

Resposta:

Respectivamente, 12, 15, 40 e 60

Explicação passo-a-passo:

Pegando pedaço por pedaço:

$\frac{3}{4} =\frac{9}{x}$

$x*3 = 9*4 = 36$

$x = 12$

$\frac{3}{4} =\frac{y}{20}$

$y = 20*3/4 = 60/4$

$y = 15$

$\frac{3}{4} =\frac{30}{z}$

$z*3 = 30*4 = 120$

$z = 40$

$\frac{3}{4} =\frac{a}{80}$

$a = 80*3/4 = 240/4$

$a = 60$

Answer 2

Olá!

$\frac{3}{4} = \frac{9}{?} = \frac{?}{20} = \frac{30}{?} = \frac{?}{80}$

$\frac{3}{4} = \frac{9}{x}$

3 × x = 3x

9 × 4 = 36

3x = 36

x = 36 / 3

x = 12

$\frac{3}{4} = \frac{9}{12} = \frac{x}{20}$

$\frac{9}{12} = \frac{x}{20}$

x × 12 = 12x

9 × 20 = 180

12x = 180

x = 180 / 12

x = 15

$\frac{3}{4} = \frac{9}{12} = \frac{15}{20} = \frac{30}{x}$

$\frac{15}{20} = \frac{30}{x}$

x × 15 = 15x

30 × 20 = 600

15x = 600

x = 600 / 15

x = 40

$\frac{3}{4} = \frac{9}{12} = \frac{15}{20} = \frac{30}{40} = \frac{x}{80}$

$\frac{30}{40} = \frac{x}{80}$

x × 40 = 40x

30 × 80 = 2400

40x = 2400

x = 2400 / 40

x = 60

$\frac{3}{4} = \frac{9}{12} = \frac{15}{20} = \frac{30}{40} = \frac{60}{80}$

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

$\frac{3}{4} \times 5 = \frac{15}{20}$

$\frac{3}{4} \times 10 = \frac{30}{40}$

$\frac{3}{4} \times 20= \frac{60}{80}$

Espero ter ajudado!