9+4+2*(5*((6*7)+8)*(3+1))=2013
18+7=25(берёз)-росло на поляне
1) 1 1/4-5/14=1 (7-10)/28=(35-10)/28=25/28 ;
2) 25/144;
3) 25/28: 25/144=(25*144)/(28*25)=36/7=5 1/7;
4) 5/14+18/35=(25+36)/70=61/70;
5) 61/70+5 1/7= 5 (61+10)/70=5 71/70=6 1/70 ...
<span>495+459=954
</span>к = 4
и = 9
<span>с = 5
</span>Удачи!