Respostas

2013-11-23T09:03:42-02:00
(-1/4)^2-3/7*[1/6-(-1/2)^3]=1/16-3/7*[1/6+1/8]= 1/16-3/7*[1*4/6*4+1*3/8*3]= 1/16-3/7*[4/24+3/24]= 1/16-3/7*7/24=1/16-1/8= 1/16-2/16=-1/16