One, two, three, four, five, six and eight questions are incomplete, so I can't write them. Seven: n(n- 1)/2 15 list cycle, * * 105 match, if 105 wins, then n should have n(n- 1)/2 wins. Nine: run Xmin in a team and have a rest. Then x+y = m+ny-4 = NX+4 = m52x-400 = 46mx = 292/3 292/3 * 52/100, and the quotient is 50, so it takes 292/3+50=442/3 to catch up.