1、 2017-2018 24 120 120 3 3 1 A. B. C. D. 2 A. 3 3 5 B. 2 2 5 C. 1 2 3 D. 2 3 6 3 P y P1 -3,6 P A. -3 -6 B. 3 6 C. 3 -6 D. 6 -3 4 45 A.4 B.6 C.8 D.10 5 A. B. C. D. 6 1 A. B.65 C.70 D. 7 7 16cm 4cm 6 8 10 A.4cm B.6cm C.4cm 8cm D.8cm 8 ABC D AB DE AC E EF BC F AB=8 BF A. 3 B. 4 C. 5 D. 6 9 xoy O P 2 2 Q
2、 y PQO Q A 5 B 4 C 3 D 2 10 ABC AE=CD BQ AD Q BE AD P APE= C AQ=BQ BP=2PQ, AE+BD=AB A 1 B 2 C 3 D 4 3 18 BAE= _ - 16 A OB OA=1 A 1 OC A1 1 AA1 OA=AA1 OA1A= A1 1 OB A2 2 A1A2 13 F E D C B A 15 11 A2 1 OC A3 3 A2A3 n n= ( 8 72 ) 17 6 2 cm 7 cm 18 7 ABC B A 70 B 2 C A B C 19. 8 1 ABC A C A -4 5 C -1 3
3、1 x y 2 ABC y A1B1C1 3 B1 A1B1C1 20 9 ABC AE ABC ED AEB AB D CAE= B 1 AC=3cm AB 2 ED AB 21. 9 EG AF AB=AC; DE=DF; BE=CF 16 EG AF,_,_. _. 22 9 ACB ADE C E D ACD AE CD BD CD=2BD 23. 12 BAC=9 BD+ BDA AEC BAC + CE BDA AEC 24. 12 ABC AB=AC=BC=10 DC=4 M 3 / 1 M CB C B N BA B A N M 2 BMN CDM BMN 2 N M N B
4、M C ABC 25 M N N / 2017-2018 BABCD DACBC 11 AC=AE B= D C= E 12 106 13 4cm 14 7 15 5 16 9 17. xcm 7-2 x 7+2 5 x 9 2 x=7 4 C=2+7+7=16 cm 6 18. B- A=70 B=2 C A= B-70 =2 C-70 2 A+ B+ C=180 2 C-70 +2 C+ C=180 C=50 4 A=30 B=100 C=50 7 19. 1 2 2 5 3 B1(2 1) 6 S A1B1C1 =3 4- 4 2- 1 2- 3 2 =12-4-1-3 =4. 8 20
5、. 1 AE ABC CAE= EAB CAE= B CAE= EAB= B ABC C=90 CAE+ EAB+ B=3 B=90 B=30 C=90 AC=3cm AB=2AC=6cm 5 2 ED AB EAB= B EB=EA ED AEB ED AB 9 21. 2 EG AF EGB= ACB 3 AB=AC B= ACB B= EGB EB=EG BE=CF GE=CF 5 EGD FCD EG=FC GED= F , EDG= FDC EGD FCD 8 DE=DF 9 22. 1 ACB ADE AB=AC AD=AE BAC= DAE=60 2 BAC- BAE= DAE-
6、 BAE CAE= BAD 4 ACE ABD AB=AC CAE= BAD AD=AE ACE ABD SAS BD=CE 7 AE CD CD=2CE 8 CD=2BD 9 23. 1 BD m CE m BDA= CEA=90 BAC=90 BAD+ CAE=90 BAD+ ABD=90 CAE= ABD ADB CEA ADB CEA AAS 2 AE=BD AD=CE DE=AE+AD=BD+CE 4 2 BDA= BAC= DBA+ BAD= BAD+ CAE=180 CAE= ABD ADB CEA ADB CEA AAS 6 AE=BD AD=CE DE=AE+AD=BD+CE
7、 8 3 DEF 2 ADB CEA BD=AE DBA= CAE ABF ACF ABF= CAF=60 DBA+ ABF= CAE+ CAF DBF= FAE BF=AF DBF EAF DBF EAF SAS 10 DF=EF BFD= AFE DFE= DFA+ AFE= DFA+ BFD=60 DEF (12 ) 24. 1 BMN CDM 1 VN=VM=3 / t=2 CM=2 3=6 cm BN=2 3=6 cm BM=BC CM=10 6=4 cm BN=CM CD=4 cm BM=CD B= C=60 BMN CDM SAS 3 t BMN NMB=90 B=60 BNM=90 B=90 60 =30 BN=2BM 4 3t=2 10 3t t= 5 BNM=90 B=60 BMN=90 B=90 60 =30 BM=2BN 6 10 3t=2 3t t= 7 t= t= BMN 9 2 I M 3 25 10=25VN VN=2.6 10 N 25VN 20=3 25 VN=3.8 12 3.8 2.6
