1-(1/4)=? 6/9=? (-4)/8=?

1-1/4=4/4-1/4=3/3
6/9=0,667
-4/8=-2

3/4 = 0, 75
6/9 = 2/3 = 0, 6667
-4/8 = -1/2 = – 0,5