1 8/27+5 17/27-6 4/27=
1* 8/27+5*17/27- 6* 4/27=10 5/9 1) 1* 8/27= 8/27; 2) 5 * 17/27= 5/1* 17/27= 85/27= 3 4/27; 3) 6* 4/27= 6/1* 4/27= 24/27; 4) 8/27+ 3 4/27= 11 12/27; 5) 11 12/27- 24/27= 10 39/27-24/27= 10 15/27= 10 5/9.