浙江省2017届中考数学一轮复习 专题练习7 平面几何基础（1） 浙教版.doc

1、 1 1 1. A B C D 2. A B C D 3. O L Y M P I C A 1 B 2 C 3 D 4 4. 4 9 A 17 B 22 C 17 22 D 13 5. A B C D 6. AB=3 BC=4 AC A AC=5 B AC 1 C AC 7 D. 1 AC 7 8. 2 9. 1 2 A y=2x 3 A A 3 5 , AB=8, AB 2 4 A a m B a 1 n (a 0) x y 4 m n. , A. 1 B. 2 C. 3 D. 4 10. 60 . . 4 a a x a 4 ) 4 ( 1 x . 3,BC 4 C r AB r 5 12

2、 . A 1 B 2 C 3 D 4 11. a b c 12. A B C A B 3 A C 1 B C _ 13. 0 3 14. 22 ABC ABC 15. ABC BAC ABC l1 l2 l3 l1 l2 1 l2 l3 2 l1 l2 l3 A B C AC 16. A B C A B C 17. 4 a b SS 2 2 2 S 6a a = Sb 6b VV 3 3 3 V aa = Vb b 1 A. B. C. D. 2 3 1.1 18 1.65 18. 1 ABCD CM , M AD . , 2 Rt BCE . (1) 2 Rt BCE , . , 3 4 .

3、 (2) Rt BCE , AB BC a b , a b x 0 1 ) 1 ( 2 m x m x , 5 . 19. AB=AC=AD AD BC C D 20. 1 AE O O ABCDEFGH 2 1 OD OA=5 OAD 6 21. A B 12 A AB 2 D CD AD 2 F 1.2 1.5 2 H GH BH C E G 1 O F FM 1 7 1 O OC A OD O 1 2 2 O r 1:0.75 i CE r 8 23. A OA=1 AB= OB D M C BC 1 BC 2 B OA P PD 9 24. ABCD O AB O AC BD E DC

4、 2 =CE CA 1 BC=CD 2 AB DC P A AF CD CD F PB=OB CD= DF 10 A B C D B 3. O L Y M P I C A 1 B 2 C 3 D 4 B 180 O I B 11 4. 4 9 A 17 B 22 C 17 22 D 13 B 4 4 4 9 9 22 9 4 4 9 4+4 9 22 B 5. A B C D C 180 A B C D C 6. B 12 0 0 135 0 =45 0 B AB=3 BC=4 AC A AC=5 B AC 1 C AC 7 D. 1 AC 7 D 4 3 AC 4 3 1 AC 7 D 8.

5、 C 180 A B D C C 9. 1 2 A y=2x 3 A A 3 5 , AB=8, AB 2 4 A a m B a 1 n (a 0) x y 4 m n. , A. 1 B. 2 C. 3 D. 4 B 13 1 2 A A y=x y=2x 3 3 3 A 3 5 AB=8 3 AB 2 AB 2 AB 3 4 A a m B a 1 n a 0 4 y x a a 1 A B m n B 10. 60 . . 4 a a x a 4 ) 4 ( 1 x . 3,BC 4 C r AB r 5 12 . A 1 B 2 C 3 D 4 C 180 0 60 108 0 12

6、0 0 4 a ( 4) 4 a x a 4 a 1 x AC=3 BC=4 C r AB D CD CD AB D B A C 14 CD AC BC BA CD 3 45 12 =CD= 5 r 3 C 11. a b c 110 12. A B C A B 3 A C 1 B C _ 3 A B C BC=2 4 A B C 2 BC 4 C 2 3 2 13. 0 70 0 15 0 0 0 14. 22 ABC ABC 5 ABC 5 BCD BFH ADC AEF CGH 15. ABC BAC ABC l1 l2 l3 l1 l2 1 l2 l3 2 l1 l2 l3 A B C

7、 AC 2 21 3 . B EF l2 l1 E l3 F BAC ABC 3 BC tan BAC AB l1 l2 l3 EF l1 EF l3 AEB BFC ABC EAB ABE FBC. 16 BFC AEB 3 FC BC EB AB EB=1 FC= 3 Rt BFC 2 2 2 2 2 3 7 BC BF FC Rt ABC 72 21 3 3 2 BC AC sin BAC 16. A B C A B C 17 O A B C ABC O AOB BOC AOC AC DAC AO AOE OD AOD AOE O E D AOB AOE B O E B O E D AOB AED SAS BO=DE AO BO OC=BD O 17. a b SS 2 2 2 S 6a a = Sb 6b VV 3 3 3 V aa = Vb b 1 A. B. C. D. 2 3 1.1 18 1.65 18 1 A 2 3 3 1.1 () 1.65 xkg 3 1.1 18 () 1.65 x x= 243 =60.75 4 60.75 18. 1 ABCD CM , M AD