6 1\4* 8\15-5 1\3*1\8 +2 2\3*1 7\18 =

1) 6 1/4 * 8/15 = 25/4 * 8/15 = 50/15 = 10/3 = 3 1/3.
2)5 1/3 * 1/8 = 16/3 * 1/8 = 2/3.
3) 2 2/3 * 1 7/18 =8/3 * 25/18 = 200/54 = 100/27 = 3 19/27.
4) 3 1/3 - 2/3 = 2 4/3 - 2/3 = 2 2/3.
5)2 2/3 + 3 19/27 = 2 18/27 + 3 19/27 =
5 37/27 = 6 10/27.