0 : (-78)=0
(-9,3) : (-9,3) = 1
-4,5 : 10= -0,45
15/12 : (-5/6+2/3)= 15/12 : (-10/12+8/12)= - 15/12: 2/12 = - 15/12 * 12/1 = -15
(-0,2+1/3) : 3,2= (-2/10 +1/3 ) : 3,2 = (-1/5+1/3) : 3,2 = (-3/15+5/15) : 3,2= 2/15:3,2 = 2/15 : 32/10 = 2/15 * 5/16 = (2*5) / (15*16) = 1/(3*8) = 1/24