Ответы на вопрос:
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
(110/51 - 8/51 * 15,3) : (-31/51) = (110/51 - 8/51*153/10) : (-31/51) = (110/51 - 12/5) : (-31/51) = (-62/255) : (-31/51) = 2/5
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