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2、 i b a z ) 1 ( ) 1 ( 2 2 ) , ( R b a A. B. C. D. 9 ( ) A B C D. 10 z1 1 i, z2 1 xi(x R) z1 z2 x ( ) A 1 B 2 C 1 D 2 2 11 10 x( ) y(kg) y 2x 7 10 2 3 3 5 2 6 7 3 4 5 10 ( ) A 14 kg B 15 kg C 16 kg D 17 kg 12 |z i| |3 4i| z ( ) A B C D : 4 5 20 . 13 ; yi x yi x ; 14 z (m 1) (m 2)i 2x y 0 m 15 3 3 15 2
3、1 3 3 an 16 z 1 sin i(cos sin ) : 6 70 . 17 10 M 1,2 m 2 5m 6 (m 2 2m 5)i N 3i M N m . 18. 12 f(x) x=1 (0,-3) 2x+y=0 f(x) g(x)=f(x 2 ) . 19 12 x( ) 2 3 4 5 y( ) 2.5 3 4 4.5 (1) 3 (2) y x y b x a (3) 10 ( b i 1 n xiyi nx y i 1 n x 2 i x 2 a y b x ) 20 12 a b R 2(a 2 b 2 a b) 2 . 21 12 A B C 1,2 i 1 2
4、i (1) AB AC BC .(2) ABC . (3) ABC 22 12 f(z) |1 z| z f( z) 10 3i z. 4 1 5: D A B C C 6 10: B D D B C 11 12: B A : 13 ) ( ) ( yi x yi x 14 4 15 . 6n 3(n N * ) 16 4 4 : 6 70 . , 17. 10 M N m 2 5m 6 (m 2 2m 5)i 3i m 2 5m 6 0 m 2 2m 5 3. m 2. 18. 12 f(x)=ax 2 +bx+c f (x)=2ax+b , 3 ) 0 ( , 2 ) 0 ( , 0 )
5、1 ( f f f . 3 , 2 , 0 2 c b b a . 3 , 2 , 1 c b a f(x)=x 2 -2x-3 g(x)=f(x 2 )=x 4 2x 2 3 g (x)=4x 3 4x=4x(x 1)(x+1) g(x) (-1,0) 19 12 x (- -1) -1 (-1,0) 0 (0,1) 1 f(x) 0 + 0 0 + f(x) 5 (1) (2) i 1 4 xiyi 52.5 x 3.5 y 3.5 i 1 4 x 2 i 54 b 0.7. a 1.05. y 0.7x 1.05. (3) x 10 y 1.05 8.05( ) 10 8.05 20 1
6、2 1 2(a 2 b 2 a b) 2 2a 2 2b 2 a 2 2ab b 2 a 2 b 2 ab a 2 b 2 ab 2(a 2 b 2 a b) 2 2 2(a 2 b 2 ) (a b) 2 2a 2 2b 2 (a 2 2ab b 2 ) a 2 b 2 2ab (a b) 2 2(a 2 b 2 a b) 2 . 21 12 (1) AB OB OA 6 AB (2 i) 1 1 i. AC ( 1 2i) 1 2 2i. BC ( 1 2i) (2 i) 3 i. (2) |AB | 2 |AC | 8 |BC | 10 |AB | 2 |AC | 2 |BC | 2 . ABC (3) (2) ABC S ABC 1 2 2 8 2. 22 12 f(z) |1 z| z f( z) |1 z| z z a bi(a b R) z a bi. f( z) 10 3i |1 (a bi)| a bi 10 3i a 2 b 2 a 10 b 3 a 5 b 3. z 5 3i.
