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2、x x C 2 21 yx D 2 3 yx 2 O r O L d L O d r A.d=r B.dr D.d r 3 5cm 4cm 9cm A B C D 4 O ABC 115 BOC A A 50 B. 60 C. 5 . 57 D. 65 5 A B C D 6 R A 0.5R R C R R D R R 7 DE C CD=30m DC A AC=5m A AB DE EC B AB=6m DE A 25m B 30m C 36m D 40m D B C A E 8 ) 0 ( 2 a c bx ax y A a0,c0; B a0,c0; D a0,b0,c0. 9 . A
3、. B. C. D. 10 4m 3m A 2 6m B 2 6 m C 2 12m D 2 12 m 11 2 2 y x mx m 1 x A B OAB A 3 2B 2 C 1 D 1 2 1 6 6 36 1 AB O O BC A AP P AC 1 ABC POA 2 2 OB 7 2 OP BC 2 CD O B CO O A 36 C ABD 3 D E AC BC CD 20m CE 40m AD=100m BE=20m DE=45m, A B 4 ABC A( 1 2) B( 3 0) C(0 0) 1 A x A 2 C x ABC A1B1C1 A1B1C1 ABC 2 1 A1B1C1 3 A B C D A B D C E 5 2 1 1 1 2 1 2 1 l 2 . 6 200 155 100 1 4 1 5 ? 7 8 AB 6 OC 5 O y 1 1 2 2.8 1 AB 8 10 E x E OE E x C AB E D A 3 0 B 0 4 . 1 AD O x y A B C 2 BE CD BE CD 3 E P P O C BOE P . B A C D E O x y
