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4、 18 5 10 1 3 6 3 2 a a 2 n 2 (m 2) 4(2 m) 19 8 2 ( )( ) 2 ( ) ( ) (2 ) x y x y y x y x y y 1 x 2 y 20 8 2 x 4 y 1 27 y 3 x 1 x - y . 21 ABCD AB CD 1 2 DB DC. (1) ABD EDC 5 (2) A 135 BDC 30 BCE 5 22 1 1 )( 1 ( 2 x x x 1 ) 1 )( 1 ( 3 2 x x x x1 ) 1 )( 1 ( 4 2 3 x x x x x1 ) 1 )( 1 ( 5 2 3 4 x x x x x x 1 2 ) 1 )( 1 ( 2 3 2 1 x x x x x x x n n n = 2 3 x=3 , 2015 2014 2013 3 2 (3 1)(3 3 3 . 3 3 3+1) _ 3 3 : 1 2 2 2 2 2 2 2 3 2012 2013 2014 4 2 : 1 2 2 2 2 2 2 2 3 2014 2015 2016 .
