Question

quanto é:

A) 2/14 = x/21 B) 4/x = 8/10

C) 2x/6 = 7/3 D) 5/5 = 6/x

Answer 1

a) 
$\frac{2}{14} = \frac{x}{21}$
(multiplicação em cruz)
14x = 2 . 21
14x = 42
x = 42 / 14
x = 3

b) 
$\frac{4}{x} = \frac{8}{10}$
8x = 4 . 10
8x = 40
x = 40 / 8
x = 5

c)
$\frac{2x}{6} = \frac{7}{3}$
2x . 3 = 6 . 7
6x = 42
x = 42 / 6
x = 7

d)
$\frac{5}{5} = \frac{6}{x}$
5x = 5 . 6
5x = 30
x = 30 / 5
x = 6

Espero ter ajudado. Valeu!

Answer 2

A) 2/14 = x/21
14*x=2*21
14x=42
x=42/14
x=3



B) 4/x = 8/10
8*x=4*10
8x=40
x=40/8
x=5


C) 2x/6 = 7/3
2x*3=6*7
6x=42
x=42/6
x=7


D) 5/5 = 6/x
5*x=5*6
5x=30
x=30/5
x=6