1、 2018 120 150 4 40 1 2 ( 1) 2 yx A 2 x B 1 x C 2 x D 1 x 2 1 3 ab b a b = A 1 3B 2 3C 4 3D 5 33 2 3 yx 1 A 2 3( 1) 1 yx B 2 3( 1) 1 yx C 2 3( 1) 1 yx D 2 3( 1) 1 yx ABC A B C ABC A B C A 1 2 B 2 1 C 1 4 D 4 1 5 8 cm 4 cm A 2 cm 2B 4 cm 2C 8 cm 2D 16 cm 26 bx ax y 2 a0 7 ABC D E AB AC ADE ABC A AD AE
2、 DB EC B AE AD AB AC C DB AB EC AC D AD DE AB BC 7 8 8 2 y ax bx c x= 1, y 0 6 x 2 60 ax bx c O x y A O x y B O x y C O x y D A B C D E A 12 0 xx B12 0, 2 xx C 12 0, 1 xx D12 2, 1 xx ABC B AB= BC= ABC A A BC DE AD y A B x y x 10 ABC ADE ACB= AED= ABC= ADE BD CE AC BC=3 4 BD CE A 5 3 B 4 3 C 5 2 D 2
3、3 5 20 11 2 21 y x x . 12 11 ( , ) A x y 22 ( , ) B x y 2 y x 12 0 xx y1 y2 . 13 A B C A B ACB= CD AB D AD=10m AC=24m A B . 14 ABC C= A= AB=11 E F AB AC EF ABC A A A E A F BC M N. AE=8 A MN ABC AF = . 8 16 A B C E F M N A 13 14 B C A D A B D y O x 5 4 4 y O x 5 4 4 y O x 5 4 4 A B C D E A C O x 5 4
4、y y ABCD E BC AE CD F AB=3 AF= DF AE k s a k s a k k S a ABC P A ABC AB1C1 11 2 BC BC AB1C1 P PMN PMN ABC 2 10 20 19 AB 4 m OC 3.2 m 2.4 m 2.1 m. . 20 ABC C AC=1 BC=2. 1 S1 ADF BDE 2 S2 1 CE BC S1 2 n Sn . 12 P A B C O A B C D E F A B C D E F 21 2 y kx m y x P P PA x A PB y B x y C D S PBD 4 1 2 OC
5、OA 1 D 2 3 0 x x . 12 22 A B A 4 B . = + A x 300 1200 x B 2 x x+140 x 1 A 300 B 2 A . 14 23 ABC ACB AC 6cm BC 8cm P B BA y x P B D A O C 5cm A Q C CB 4cm B t 0 t 2 PQ. 1 BPQ ABC t 2 t ACQP 3 AQ CP AQ CP t . 2017-2018 1-10 BCACC DDBBA 11. 0 12. 12 yy 13. 57.6m 14. 43 8 15. y=a(x+2) 2 +3 0 -3 4a 3= 3 a= 2 3 y= 2 3(x+2) 2 CF AB, CEF CF AB = EF AE EF=CF P 17. 1 a=0.1 s=700 k s a s = 70 a 2 a=0.08 s= 70 0.08 875 18. 1 AB1C1 2 PMN ( PM PN MN ) 19 O AB x , 2 0.8 3.2 yx x = 1.2 y=2.0480, t=1 3 P PM BC M AQ CP N PB 3t MC 8 4t NAC+ NCA PCM+ NCA NAC PCM ACQ CMP ACQ CMP AC CM CQ MP 6 84 t 4 3 t t t 7 8
