4/21 : 6/7 = 4/21 * 7/6 = 2/3 * 1/3=2/9
-8/9 : (-10/3) = - 8/9 * (-3/10) = - 4/3*(-1/5)=4/15
6/7:(-9)=6/7*(-1/9)=2/7*(-1/3)=-2/21
5/14:10/21=5/14*21/10=1/2*3/2=3/4
4/5:1 1/5=4/5:6/5=4/5*5/6=2/1*1/3=2/3
-1 2/5:(-2 1/10)=-7/5:(-21/10)=-7,5* (-10/21)=-1 * (-2/3)= 2/3
2 1/12 : (-1 7/8) = 23/12:(-15/8)=23/12*(-8/15)=23/3*(-2/15)= - 46/45= - 1 1/45
1 1/12 : 1 5/8= 13/12 : 13/8= 13/12*8/13=1/3*2/1=2/3
-0,1:2/5=-1/10*5/2=-1/2*1/2= - 1/4
3/4:0,2=3/4:2/10=3/4*10/2=3/2*5/2=15/4= 3 3/4
1/3:0,25=1/3:1/4=1/3*4/1=4/3=1 1/3
2/3:(-0,6)=2/3:(-6/10)=2/3*(-10/6)=1/3*(-10/3)= -10/9 = -1 1/9
