1、 2018 10 3 30 1 A B C D 2 2 2 yx 1 3 A 2 2( 1) 3 yx B 2 2( 1) 3 yx C 2 2( 1) 3 yx D 2 2( 1) 3 yx 3 ABC ABC A AB C C BC AC C A B C D 4 O 10 O AB 3 AB A 4 B 6 C 7 D 8 5 m n 2 5 2 0 xx m n mm A 7 B 7 C 3 D 3 6 2015 100 2017 331 x A 100(1 2 ) 331 x B 2 100(1 ) 331 x C 2 3 100(1 ) 331 x D 2 100 100(1 ) 1
2、00(1 ) 331 xx 7 PAOB OMN P MN M N P MN PAOB PA 2 +PB 2 A B C D 8 2 y ax bx c x= 1 b 2 4ac abc 0 a+b=0 a+b+c 0 a b+c 0 A B C D 9 2 y ax bx c C y OA=OC A 1 ac b B 1 ac b C 1 ac b D 1 ac b 10 2 ( ) 5 y x h h x x y 1 h A 1 5 B 1 3 C 1 3 D 1 5 3 7 8 9 3 24 11 ABC A AED AB=3 BE= 12 x 2 ( 1) 6 3 0 k x x k
3、13 1 ( 3, ) Ay 2 (0, ) By y x 2 4x 5 y1 y2 = 14 ABC C AB=6 C CB AB D AC= 15 h( m) t( s) h 30t 5t 2 s 16 a b 2 2 2 2 ( )( 2) 8 0 a b a b 22 ab 17 2 2 y ax ax k x 2 2 3 0 ax ax k 18 2 2 y x x P 2 yx AB P PAB 11 14 17 18 96 19 5 2 5 6 0 xx 20 10 x x 2 2 k 1 x+k 2 =0 x1 x2 1 k 4 2 |x1+x2|=x1x2 1 k 6 21
4、10 1 O 4 2 AB=8cm 2cm 6 22 10 ABCD 25m 40m 1 168m 2 AB 4 2 6 23 12 m (a b) n (c d) mn u r r g ac bd m (1 2) n (3 5) mn u r r g 13 1 m (2 4) n (2 3) mn u r r g 2 2 m (x+2 1) n (x 2 3x 1) y mn u r r g 4 1 y m n u r r g 2 3 yx 4 12 yy x 2 24 10 20 y x 22 780 25 750 1 y x 4 2 30 6 25 13 y x 2 2x 3 x A B
5、 A B y C D 1 A C D 3 2 E BCE E 5 3 P P x AC F P F O C P 5 26 13 ACD MN A AC=DC DB MN B BC 1 1 BCD C ECA E MN 3 AB BD CB 5 2 MN A 2 AB BD CB 5 27 13 y= x 2 +2mx m 2 +3 m 1 m x 5 2 y x 5 3 y= x 2 +2mx m 2 +3 m y=3 G G y=x+2 m 3 1 C 2 A 3 C 4 D 5 C 6 D 7 C 8 D 9 B 10 D 11 32 12 4 k 1 k 13 14 33 15 6 16 4 17 12 0, 2 xx 18 ( 1,2) 19 12 6, 1 xx 20 1 1 2 k 2 3 k 21 1 C AC AB O 2 5cm 22 1 14m 6m 2 AB=10m 200m 2 23 1 -8 2 2 35 y x x ( 4, 1),(2,5) 4 x 2 x 24 1 10 1000 yx 2 30 7000 25 1 ( 3,0) A (0,3) C ( 1,4) D 2 ( 1,2) 3 3 21 2 26 1 2 2 AB BD CB 3 2 AB BD CB 27 1 12 2 3 335 44 x
