solve
When n=3, m = 6;;
When n=4, m = 4;;
When n=5, m has no integer solution;
M = 3; when n=6;
When n >; At 6 o'clock, there is no complete splicing (because if there is, m=2, which means that the inner angle is 180 degrees, which is obviously not true).
(1) The teaching network of Xueda Education.
Shanghai xueda education
Shanghai Xueda Education has 26 teaching outlets in Shanghai 13