Respostas

2014-01-29T21:11:44-02:00
A) r= -3 - (-7) = -3 + 7 = 4
b) r = 1/2 - 1/4--》tirando mmc 1 - 2/4, logo r = 1/4
c) 11/6 - 1/2 --》tirando mmc 11-3/6 = 8/6 =4/3, logo r = 4/3