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8、| | Z|X|X|K 20 100 120 706 . 2 3 80 40 100 20 ) 10 30 10 70 ( 120 2 k % 90 - 6 2 2 A 3 2030 2030 2 3040 4 6 3 20 A 16 5 4 20 16 A P- 12 19. 1 F B 1 BC F 1 AB1 1 EC B FEB , BC EC BE 2 1 2 1 1 , F BC G ABC B B AA GE B B AA GE AB GE FB FE FA FG 1 1 1 1 1 1 / , , / 3 1 面 面 -6 2 1 3 1 1 ABC C ABC E V V -
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12、x x x x x x x x x x 2 1 2 1 2 1 2 2 ln x x x x x x 1 , 0 2 1 x x t 0 1 1 , 1 2 2 ln 2 2 t t t t g t t t t g t g 1 , 0 0 1 g t g - -12 22. 1 DE DAB DCB EAD EDC ,AD EAB , DCB EDC DCB EDC -5 2 AC BC CBA CAB DBA EDA 2 3 , 2 1 ACB CAD DBC , 7 2 , 2 7 BAC23. 1 1 4 , 1 2 2 y x x y -4 2 为参数 t t y t x 2 2 1 2 2 2 2 C 0 8 2 12 5 2 t t5 8 2 1 t t -10 24. 1 m a x m a x m a 3 , 2 5 1 m a m a m a -5 2 2 a x t x 2 2 0 , 2 , 2 t x t x x , 2 2 0 , 2 , 2 0 t x x t x x x t x x 2 , 0 2 2 , t -10 : Z X X K
