Respostas

2013-10-02T13:05:27-03:00
A) 6/8 x 9/x - inversamente proporcional

 6*X = 9*8 = 12

B) 6*14 = 12*X = 7

D) 2X * 10 = 8 * 5 == 2x * 10 = 40 == 2x= 40/10 == 2x= 4 ==  X=4/2 == X=2