1、 2017-2018 120 120 19 20 21 22 23 24 25 26 12 3 36 0 1 2 1 ( ) A. 3.14 B. 1 6 C. 3 D. 36 2 Rt ABC C 90 D AC DA DB 5 DAB 10 DC ( ) A. 3 B. 4 C.5 D. 6 3. ABC ,DE AC AE=3cm, ABD 12cm ABC ( ) cm. A. 15 B. 16 C.17 D.18 4 A a=9 b=41 c=40 B a=b=5 C=5 2C a:b:c=3:4:5 D a=11 b=12 c=15 2 A E D C B 3 5 10 12 (
2、) A 24 B 48 C 96 D 36 6 1 2 3 1 ( ) A 2 B 4 C 6 D 8 7 ( ) 8 ABCD AB=4cm BC=3cm CD=12cm DA=13cm ABCD A 6cm 2B 30cm 2 C 24cm 2 D 72cm 29 A B C A AC BC B AC BC C AC BC D A B 10.BE AC D AD CD BD ED ABC E A B C D 11. ABC AB BC CA 20 30 40 ABC A 1 1 1 B 1 2 3 C 2 3 4 D 3 4 5 12 12 6 8 A B DE S BCE S ADE C
3、 B A D A C E B10 A B CO 11 A 2 5 B 16 25 C 14 25 D 14 21 6 3 18 13 36 14 10 _. 15 ABC _. 16 OP MON PA ON A Q OM PA=2 PQ 17 8 6 30 18 ABC AB=AC BAC ACD D ADC BAC _. 18 16 17 A B C 8 66 19 6 6 2 2 y x x y x 20 8 1 AB P P BC AC 2 AC Q Q B C 21 9 OA=OB. 1 A 2 A -3.5 3 17 . A B C A A B A A A O A 1 A -1 A
4、 -2 A -3 A -4 A -5 A 3 A A A x 22 9 ABC D BC AB=10 BD=6 AD=8 AC=17 ABC 23 10 ABCD AB=AD=6 A ADC ABCD 30 BC-CD D C B A 24 12 ABCD DC = 9 DC E AE AED D BC F ABF 54 FCE 25 12 D F E B C A A B C E E (1) ABC EBE AB=BC BE=BE AE=1 BE=2 CE=3 (2) ACD ECB AC=DC DB MN B ACE DCB CB=5 BD+AB 3 36 1 C 2 A 3 D 4 D 5
5、 B 6 A 7 C 8 C 9 C 10 B 11 C 12 C 3 18 13 6 14 50 80 15 45 16 2 17 3 18 20 8 66 19 6 20 20 x x 2 2 x x x=2 x=2 y= 6 y x =( 6) 2 =36 y x 6 20 8 1 4 2 8 21 9 1 13 . 2 2 13 -3.5. 2 3 D 17 . 3 3 . 22 9 6 2 +8 2 =10 2 =100 BD 2 +AD 2 =AB 2 ABD ADC=90 3 Rt ADC DC 2 =AC 2 -AD 2 =17 2 -8 2 =225=152 DC=15 BC
6、=BD+DC=21 6 S ABC= BC AD= 8 21=84 9 -4 A A A x O A A A -2 A A A 1 A A A C A A A D A A A 23 10 AB=AD=6 A ABD BD=6 2 ADC ADB BDC=9 4 ABCD 30 BC+CD=30-2 6=18 6 2 2 2 BC CD BD BC+CD (BC-CD)=36 8 BC-CD=2 10 24 12 1 54 2 AB BF DC = 9 BF=12 2 AB=9 BF=12 AF= 22 9 12 15 5 BC=AD=AF=15 CF=BC-BF=15-12=3 8 DE=x CE=9-x EF=DE=x 2 22 93 xx x=5 DE 5 10 EC 4 11 S FCE= = 4 3=6 12 25 12 1 135 -3 2 -1 ACE DCB-3 AEC DBC-5 D F E B C A D C B A 2 2 5 50-4
