5 4/5+2 3/8·(2²+9³):13=5 4/5+2 3/8·(4+729):13=5 4/5+2 3/8·733:13=
=5 4/5+2 3/8·733/13=5 4/5+19/8·733/13=5 4/5+13927/104=
=5 4/5+133 95/104=5 416/520+133 475/520=138 891/520=
=139 371/520
