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1、 xx 12 xx +xxx xB VxxVx n x i i n i i n i i n = = ()() 1 22 1 2 1 1 S n xxS n x n x i i n i i n i i n 2 1 222 1 2 1 1 1 1 1 1 = = = ()() S n xxS n x n x i i n i i n i i n = = = 1 1 1 1 1 1 22 1 2 1 ()() 756. 3)72. 380. 379. 370. 377. 3( 5 1 =+=x 7.39 71845544. 27.39 = ah 2 1 =S 1 2 722 OCrK 6 1 = 1
2、6 G xx S G xx S n n 1 1 = = , x x xxxx n n = + + 123 . S xx n = ()2 1 14.40=x G xx S 1 1 40144002 0067 18= = = . . Q xx xx Q xx xx n nn n = = 21 1 1 1 Q xx xx n = = = 21 11 14 9014 65 1501 14 65 0694 . yabx=+ b n xyx y n xx = 22 () a xyx xy n xx = 2 22 () b = = 6175831002 451 622103100 00808 2 . .(.
3、) . a = = 22102451 3100 1758 622103100 000906 2 . yx=00808000906 y0008080000906000906= . y1008082 00009060152= y2008084 000009060314= 2 1 S 2 2 S F S S = 1 2 2 2 21 ffa F 21 ffa F 2 2 21 2 ff a F F S S = 1 2 2 2 790 562 140 . . . 025. 0 2 05. 0 2 = a 21 ff FF t xn S = t xx S nn nn = + 21 12 12 S nSnS nn = + + ()() 11 2 22 2 12 11 2 x x 12 , S t xn S = = = 18106180946 30734 09564 . . 1 12 xx xx Q n n = 11 12 xx xx Q n = 1 1 xx xx Q n nn = 2 1 xx xx Q n nn = 12 13 xx xx Q n = 3 2 xx xx Q n nn = 75.90 1 =x 67.91 2 =x t xx S nn nn = + = + = 21 12 12 91679075 033 66 66 483 . .