1) (7 * 12 * 99) : 11 = 7 * 12 * (99 : 11) = 7 * 12 * 9 = 756.
2) (33*17*5) : 11 = 17 * 5 * (33:11) = 17 * 5 * 3 = 255
3) (6 * 44 * 13) : 11 = 6 * 13 * (44 : 11) = 6*13*4 = 312
4) (22 * 12 * 8) : 11 = 12 * 8 * (22 : 11) = 12 * 8 * 2 = 192
5) (15 * 88 * 3 ) : 11 = 15 * 3 * (88:11) = 15 * 3 * 8 = 360
6) (11*22*33) : 11 = 11 : 11 * 22 : 11 * 33 : 11 = 1 * 2 * 3 = 6