1、 2018 120 150 4 , 40 . 4 0 1 1 x x A 1 x B 1 x C 1 x D. 1 x 2 A 8B 10C 12D 203 0 2 2 x x A 0 2 1 x x B 2 2 1 x x C 0 1 x 2 2 x D 0 1 x 2 2 x 4 2 43 xx A 2 ( 4) 19 x B 2 ( 4) 19 x C. 2 ( 2) 7 x D. 2 ( 2) 7 x 5 A 6cm 2cm 1cm 4cm B 4cm 5cm 6cm 7cm C 3cm 4cm 5cm 6cm D 6cm 3cm 8cm 4cm 6 ABC DE BC = , = A
2、 B C D 7. A 2 2 1 0 xx B. 2 2 1 0 xx C. 2 2 4 0 xx D. 2 2 4 0 xx 8 100 81 x x A 2 100 81 x B 2 100(1 ) 81 x 5 3 5 2 3 2 3 1 ( 6 ) DB AD 3 2 EC AEC 2 100(1 ) 81 x D 2 100(1 %) 81 x 9 a b 0 9 2 2 x x b a a 2 A 11 B 0 C 7 D -7 10 5 5 ABC 1 ABC DEF DEF A 2 B 5 C 2 5D 10 4 24 11 8 2 12 3 2 a b ab b 13 x=
3、2 x 0 4 2 k x x k= 14 A C AC B BA BC BA BC E F E F 30 A C AC= 15. ABC BD=DC AE=EB AD CE O DO=2cm AO= cm 16 xOy AB y= x+m x y A B C 2 0 1 AB C m= 2 P OB PA PC CPA= ABO m 86 17 8 1 0 2 6 3 12 3 ( 10 ) ( 14 ) ( 15 ) ( 16 ) x y B A 1 2 3 4 5 6 7 1 2 3 4 5 6 7 O18 8 x 2 -6x+5=0 19 8 (3 ) ( 3)( 3) a a a a
4、 21 a20 8 O OAB 2 B A O A B A B A B 1 B A O 2 OAB 3.5 B A O 21.(8 ) x1 x2 0 2 c bx ax x1+x2 = a b x1 x2= a c : x1 x2 0 2 2 m x x 4 1 1 2 1 x x m 22 10 . ? P B ABCD, 1 P A B PC AD E DE 3 ( 0.1 1 =10 1 =10 ) 23 10 30 / 5 1 0.1 / 30 x x 30 x y / 1 y 2 32 / 25 = 0 x 5 x 为整数 5 x 30 x 为整数 24 13 ( ) 1 1, A
5、BC CD A=40 , B=60 , CD ABC . 2 ABC A=48 ,CD ABC ACD ACB 3 2, ABC AC=2,BC=,CD ABC ACD CD . CD 1 2 25. 13 ABCD AD=6 OA OB x x 2 7x+12=0 OA OB 1 OA OB 2 E x S AOE= AOE AOD 3 AB F A C F F 2017 4 40 1 2 3 4 5 6 7 8 9 10 C B C D D B B C A B 4 24 11 2 12 13 12 14 60 15 4 16 2 12 89 17. 8 1 0 2 6 3 12 3 18.
6、 8 x 2 -6x+5=0 1-2+3 (6 ) (x-1) x-5 =0 (4 ) 2 8 x-1=0 x-5=0 (6 ) x=1 x=5 (8 ) 19 8 (3 ) ( 3)( 3) a a a a 21 a 3a-a 2 +a 2 -3 (4 ) 21 a 3 2 +1 -3 =3a-3 (5 ) =3 2 +3-3 =3 2(8 ) 20 8 1 B A O (4 ) 2 OAB 2 B A O S OAB :S B A O =1:4 (6 ) S B A O =4 S OAB =4 3.5 =14 (8 ) 21. (8 ) x1+x2 = -2 ,x1 x2=m (4 ) 2
7、 5 B A x y B 20 A 1 2 3 4 5 6 7 1 2 3 4 5 6 7 O 4 1 1 2 1 x x 2 1 2 1 x x x x = m 2 =4 (6 ) m= 2 1 (8 ) 22 10 ; ABCD, 1 AB=AD=CD=10 DE=3 =0.3 AE=10-0.3=9.7( ) (2 ) AB CD PA CD PAE CDE (4 ) CD PA = CD AE(6 ) 10 PA = 3 . 0 7 . 9 PA 323.3( ) (8 ) PB=PA+AB=323.3+10=333.3 333.3 (10 ) 23 10 1 ); , 30 5 (
8、5 . 30 1 . 0 ) , 5 0 ( 30 x x x x x y(4 ) 2 5 0 x 25 10 5 ) 30 32 ( 5 30 5 x 25 ) 5 . 30 1 . 0 ( 32 x x 7 25 1 x 10 2 x 9 10 10 24 13 1 A B= ACB ABC . (1 ) CD ACB ACD BCD ACB ACD A ACD . (2 ) DCB A CBD ABC BCD BAC. (3 ) CD ABC . (4 ) (2) AD=CD ( ACD A BDC BCA BCD A ACB ACD BCD ) AD=AC ( ACD ADC= BDC
9、 BCA BCD A ACB ACD BCD ) AC=CD ( ADC A BDC BCA BCD A ADC BCD, . ACB ) (3) AC=AD=2. BCD BAC = . (10 ) BD=x , x= . x x= 1. (11 ) BCD BAC = = , (12 ) CD= ( 1)= . (13 ) 25 13 1 x 2 7x+12=0 x1=3 x2=4 (2 ) OA OB OA=4 OB=3 (3 ) 2 S AOE= OE= (4 ) = = = = = (5 ) AEO= (6 ) AOE AOD (7 ) 3 ABCD AD=6 BC=AD=6 OB=3 OC=6 3=3 AC= = =5 AB y= x+4 (8 ) F a a+4 AF 2 =a 2 + a+4 4 2 = a 2 CF 2 = a 3 2 + a+4 2 = a 2 + a+25 (9 ) AF=AC a 2 =25 a= 3 a=3 a+4= 3+4=8 a= 3 a+4= 3 +4=0 F 3 8 3 0 (11 ) CF=AC a 2 + a+25=25 25a 2 +42a=0 a=0 a= a+4= +4= F (12 ) AF=CF a 2 = a 2 + a+25 a= a+4= +4= F (13 ) F 3 8 3 0 A C F
