@ @WU@ @ÖïÐaínÜaì@Þî†bjnÜa@ @ 5 MM 10 [TFAOC] ( ) . . 8 [Math counts 1985] ( ) 1!+ 2!+ 3!+ + 14 !+ 15! . 5 [MAΘ 1990] ( ) 10 6 8 [MAΘ 2011] ( ) . . 15 [MAΘ 2011] ( ) . A . [MAΘ 2011] ( ) C A+B a + b + 2c = 35 BC [MAΘ 2010] ( ) B