Respostas

2014-02-23T11:58:13-03:00
3/7x - 2/5= 11/3 x
faz mmc : 15x/35 - 14/ 35 = 11x/3
multiplica cruzado
3. (15x-14) = 11x . 35
45x - 42= 385x
- 42 = 385x- 45x
-42/340 = x
x = 21/ 170