Ответ: (2 8/51-8/51*15,3):(-31/51)=2/51)8/51*15,3=8/51*153/10=12/5=2 2/52)2 8/51-2 2/5=2 40/255-2 102/255=550/255-612/255=-62/2553)-62/255:(-31/51)=62/255*51/31=2/5