Question

calcule o valie de x nas figuras abaixo:

Answer 1

a) 2/3=5/x
  2x=15
  x=15/2
  x=7,5

b)3/6=x/12-x
3(12-x)=6x
36- 3x=6x
36=6x +3x
9x=36
x=36/9
x=4

c) 10/15 = x/x+3
10(x+3) = 15x
10x + 30= 15x
30=15x -10x
5x=30
x=30/5
x=6