1、 2017 10 3 30 1 2017 A 2017 B C 2017 D 2 A B C D 3 18 185 185 A 1.85 10 9B 1.85 10 10C 1.85 10 11D 1.85 10 124 A 2x 5 2 =2x 10B 3 2 = C a+1 2 =a 2 +1 D a a b = b 5 50 3000 80 50 A 16 B 17 C 33 D 34 6 x kx 2 3x =0 k A k=0 B k 1 k 0 C k 1 D k 1 7 10 y x y x A B C D 8 a b a+b A 10 B 11 C 12 D 13 9 3 A
2、B C D 10 y=ax 2 +bx+c a 0 x= 2 x 3 0 4 0 4a b=0 c 0 3a+c 0 4a 2b at 2 +bt t y 1 y 2 y 3 y 1 y 2 y 3 A 4 B 3 C 2 D 1 9 3 27 11 89.5 S 2 =0.15 S 2 =0.2 12 y= +x 2 x 13 ABCD AC BD O 14 4m 2 36= 15 AC O C BC O AB O D OD COD 16 ABC AB=AC=10 BC=12 BC AD 2 1 c n j y17 CD ABC ACD CBD ABC ACB 18 OABC OA x O
3、tan AOC= y= C AB D COD 20 k 19 OA 1 A 2 OA 1 y OA 1 =A 1 A 2 =1 OA 2 OA 2 A 3 OA 3 OA 3 A 4 OA 2017 A 2018 A 2017 63 20 +1 3 21 1 ABC A 3 4 B 5 2 C 2 1 1 ABC y A 1 B 1 C 1 2 ABC O A 2 B 2 C 2 3 2 OA 22 y= x 2 +bx+c x A 1 0 B 3 0 y C BC E D 1 2 C D 3 P S ABP =4S COE P y=ax 2 +bx+c a 0 23 ABC AD BC D
4、BD=AD DG=DC E F BG AC 1 DE=DF DE DF 2 EF AC=10 EF 24 1200 1 a= b= 2 3 4 1 1 0 x 0.5 10 0.05 2 0.5 x 1.0 20 0.10 3 1.0 x 1.5 80 b 4 1.5 x 2.0 a 0.35 5 2.0 x 2.5 12 0.06 6 2.5 x 3.0 8 0.04 25 150 / 5 m / y x 21 1 a= b= m= 2 120 / 3 2 100 4 v / v 21 26 OABC AC B D DC y E OABC OC OA x x 2 12x+32=0 OA O
5、C 1 OA OC 2 ADE COE OE 3 D 4 F AC P E C P F P 21*cnjy*com2017 10 3 30 1 2017 A 2017 B C 2017 D 15 | 2017|=2017 C C 2 A B C D P3 A B C D D 3 18 185 185 21*cnjy*comA 1.85 10 9B 1.85 10 10C 1.85 10 11D 1.85 10 12 1I a 10 n 1 |a| 10 n n a n 1 n 1 n 185 =1.85 10 10 B 4 A 2x 5 2 =2x 10B 3 2 = C a+1 2 =a 2
6、 +1 D a a b = b 47 44 4C 6F A 2x 5 2 =4x 10 A B 3 2 = = B C a+1 2 =a 2 +2a+1 C D a a b =a a+b=b D B 5 50 3000 80 50 A 16 B 17 C 33 D 34 C9 m 50 m 3000 m 50 m 80m+50 50 m 3000 m 16 m m 16 16 A 6 x kx 2 3x =0 k A k=0 B k 1 k 0 C k 1 D k 1 AA k=0 3x =0 k 0 = 3 2 0 k k=0 3x =0 x= k 0 = 3 2 0 k 1 k k 1 C
7、 7 10 y x y x A B C D F3 K6 KH x 2x+y=10 y= 2x+10 x 2.5 x 5 2.5 x 5 y x D D 8 a b a+b 21 * A 10 B 11 C 12 D 13 U3 2 3 3 1 7 1 3 1 5 a+b=12 C 9 3 A B C D MP I6 3 = r R n S 2 l S =3S 2 l =l S = l R 2 = R R=3r l = A 10 y=ax 2 +bx+c a 0 x= 2 x 3 0 4 0 4a b=0 c 0 3a+c 0 4a 2b at 2 +bt t y 1 y 2 y 3 y 1 y
8、 2 y 3 A 4 B 3 C 2 D 1 H4 H3 H5 HA x x x= 1 y 0 x= 2 x= 2 x= = 2 4a b=0 x 3 0 4 0 1 0 0 0 y y c 0 x= 1 y 0 b=4a a b+c=a 4a+c= 3a+c 0 x= 2 4a 2b+c at 2 +bt+c 4a 2b at 2 +bt t x= 2 y 1 y 3 y 2 B 9 3 27 11 89.5 S 2 =0.15 S 2 =0.2 W7 W1 s 2 s 2 12 y= +x 2 x x 4 x 0 E4 0 x+4 0 x 0 x 4 x 0 x 4 x 0 13 ABCD
9、 AC BD O AB=BC LF LB AC BD AB=BC ABCD AB=BC ABCD AB=BC 14 4m 2 36= 4 m+3 m 3 55 4 =4 m 2 9 =4 m+3 m 3 4 m+3 m 3 15 AC O C BC O AB O D OD COD 21 cn jy com MC ABC COD AC O OB=OD B= COD=2 16 ABC AB=AC=10 BC=12 BC AD 10cm 2 cm 4 cm 21 PC A AD BC D ABC AB=AC=10cm BC=12cm BD=DC=6cm AD=8cm ACBD 10cm AD=8cm BC C CE BD E EC=8cm BE=2BD=12cm BC=4 cm BD=6cm AE=6cm EC=2BE=16cm AC= =2 cm 10cm 2 cm 4 cm 17 CD
