Efectuați calculele: a) 1/2+[1/4+(-1/8)]
b) 5/6+(-7/2)+[10/3+11/6+2/5)+(-13/5+10/3+1/2)]
c) -1/3+[-1/6+(-1/9)]
d) 19/36 + { [ 0,(4)+(-37/24)]+(-5/18)}

va roggg repede repedee va rog dau coroana va rog repede​