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B) 22/5 * 20/11= 440/55= 8
C) 5/4 : 5/2= 5/4* 2/5= 10/20
D) 20/9 : 19/6= 20/9 * 6/19= 120/171
b.4 i 2/5 : 11/20=22/5*20/11=2/5*20/1=40/5=8
c.1 i 1/4:2 i 1/2=5/4:5/2=1/4*2/1=2/4=1/2
d.2 i 2/9:3 i 1/6=2-/9:19/6-=20/3*2/19=40/57