1)8/51*15,3=8/51*15 3/10=8/51*153/10=12/5
2)2 8/51-12/5=110/51-12/5=550/255-612/255=-62/255
3)-62/255:(-31/51)=62/255:31/51=62/255*51/31=2/5
1)8/51*15,3=8/51*15 3/10=8/51*153/10=12/5
2)2 8/51-12/5=110/51-12/5=550/255-612/255=-62/255
3)-62/255:(-31/51)=62/255:31/51=62/255*51/31=2/5