Question

QUESTÃO 02 - Se a // b // c, de acordo com o Teorema de Tales, calcule x:
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Answer 1

a) 2/4 = 3/x

multiplica em cruz

2x = 12

x = 12/2

x = 6

b) 4/12 = x/21

12x = 84

x= 84/12

x = 7

d) x/9 = 8/12

12x = 72

x = 72/12

x = 6

e) 9/x = 18/4

18x = 36

x = 36/18

x = 2

f) 10/15 = 3x + 1 / 5x - 2

15 (3x + 1) = 10 (5x - 2)

45x + 15 = 50x - 20

45x - 50x = - 20 - 15

- 5x = - 35 ( - 1 )

5x = 35

x = 35/5

x = 7