Respostas

2013-09-17T17:52:00-03:00
A) 1/3 + + 1/10 = mmc = (10+60+3):30 = 73/3
b) (2/5 + 1/2)*2/10 -1
(4+5)/10 *2/10 -1
9/10*2/10-1 = 18/10 -1 = 1,8 -1 = 0,8