1、 2018 10 1 A B C D 2 2 3 9 4 . . . . 3 2 4 9 A B C D 3 y x A y=B y= C y= D xy= 4 A B C D 5 2x 2 5x+3=0 A B C D 6 ABC DE BC = AE=2cm AC A 2cm B 4cm C 6cm D 8cm 7 A B A B C D 8 x x 2 x m=0 x=1 m A 1 B 0 C 1 D 2 9 k y x y kx k A B C D 10 ABCD M BC ME AM ME AD E AB=12 BM=5 DE A 18 B C D 6 11 x 2 =x 12 2
2、 3 8cm 2 cm 2 13 10 100 30 14 2 2 1 m y m x m 15 P 3 4 16 k y x k k 0 A A AB x B AOB 1 k= 9 1 0 1 17. 7 1 3 18 x 2 +3x 4=0 19 A B C AB BC E EC BC BC AE D BD=150 DC=60 EC=50 AB 20 ABCD AC BD O OA=OB 1 ABCD 2 AB=6 BC 21 12 12 12 1 2 22 ABCD 1 ABC AD E 2 AB=AE 23 56 1 180 2 200 24 y=mx+1 A 1 0 y k x k
3、0 B n 2 1 2 3 1 x 6 y 25 Rt ABC AC=20cm BC=15cm P A AC C Q C CB B P 4cm/ Q 2cm/ t 1 t=3 P Q 2 CPQ S S t 3 t C P Q ABC 10 1 D 2 D 3 A 4 B 5 B 6 C 7 C 8 B 9 A 10 B 6 11 x1=0 x2=1 12 18 cm 2 13 3 14 1 15 3 4 16 2 9 17 =7 1+3=9 18 x1=1 x2= 4 19 AB BC CE BC ABD ECD AB CE=BD CD AB 50=150 60 AB=125 AB=125
4、20 1 ABCD AO=OC BO=OD OA=OB OA=OB=OC=OD AC=BD ABCD 2 OA=OB OAB= ABCD AC=2BC AB= = BC BC= AB=6 =2 21 1 6 7 8 9 3 9 10 11 12 4 10 11 12 13 5 11 12 13 14 12 2 1 12 12 6 12 3 = = 22 1 2 BE ABC ABE= EBC AD BC AEB= EBC ABE= AEB AB=AE 23 1 x 28 x x 28 x =180 x1=10 x2=18 28 x=28 18=10 18 10 2 x 28 x x 28 x =200 x 2 28x+200=0 =28 2 4 200=784 800 0 200 24. 1 y=mx+1 A 1 0 m=1 y=x+1 2 B n 2 y=x+1 n=1 B 1 2 y= k=2 y= 3 x=1 y= =2 x=6 y= = 1 x 6 y y 2 25 AP=4t CQ=2t CP=20 4t 1 t=3 CP=20 4t=8cm CQ=2t=6cm PQ= 2 AP=4t CQ=2t CP=20 4t Rt CPQ S= cm 2 3 Rt CPQ Rt CAB t=3 Rt CPQ Rt CBA t= t=3 t= C P Q ABC
