11/15 *25/33+1 3/4. 2 1/16-2/3*7/12
11/15 * 25/33 +1 3/4 = 5/9 +7/4 = 83/3 6=2 11/36 2 1/16 -2/3 * 7/12 = 33/16 -7/18 = 241/144 = 1 67/144