Respostas

2014-07-22T13:57:06-03:00
A) -3/7 • (2-3/5) = -3/7 + 7/5 = -21/35 = -3/5

b) 2 - 0,25 • (-3)= 1,75 • (-3) = -5,25

c) (nao tenho certeza) -5 - 3,75 : 0,5= -5 + 0 = -5