1、 2018 B 150 120 4 40 1. A. B. C. D. 3 2. 2 A .45 B .60 C .72 D .120 3. 5 A. B. C. D. 4. 20 2 2.5 3 3.5 4 1 2 8 6 3 20 A. 8 B. 3 C. 3 D. 0.34 5. A 2 m B n 3 A. m 0 n 0 B. m 0 n 0 C. m 0 n 0 D. m 0 n 0 6 6. AC=30cm BC A. 30 cm B. 20 cm C. 10 cm D. 5 cm 7. 1 a 2 3 A. 2a 3b B. 4a 10b C. 2a 4b D. 4a 8b 8
2、 x m x+h 2 +k=0 m h k x1= 3 x2=2 m x+h 3 2 +k=0 A. x1= 6 x2= 1 B. x1=0 x2=5 C. x1= 3 x2=5 D. x1= 6 x2=2 9. 16 9 a b a b b a A. 5 B. 6 C. 7 D. 8 10. 40 50 9 A. 43 B. 44 C. 45 D. 46 . 5 30 11. x 2 2x= 12. 2 3 x 5 7 5 13. 1 O A B OAB 14. A 66 B 60 2 x . 15. OABC A C x y B OABC O B y ODEF BC OD M M y= x
3、 0 AB N S OABC=32 BN 16. B OM A ABCD P BM CP CP C CE BE AB=4 BE 8 80 17. (1) | 3| +1 0 + 2 2 (2) 1 18. AE=DB BC=EF BC EF ABC DEF 19. 4 1 2 13 15 16 6 18 1 2 800 3 3 1 2 2 2 20. 1 A B C AB AB 2.5 . 21. AB C AD BD AD BC E (1) BD=BE (2) DE=2 BD= CE 22 A 6 3.2 A 400 6 6 A 6 A 6 25% (1) 6 A (2) 7 A B 50
4、B A 21 A B A B / 1100 1400 / 2400 23. y= x 2 2x+3 x A B y C D (1) A B C (2) M AB M A B M x AC E P P Q Q N PMNQ (3) 2 PMNQ DQ F y AC G G F FG=2 DQ F 24 1 ABC C AB=5cm BC=3cm P AC 5cm/s A C P PD AB D APD PD A DP P x s 1 PD=_ AD=_ x 2 A BC x 3 2 Q P BC 5cm/s B C Q QE AB E BQE QE B EQ A B A B ABC A B A
5、QE BE B Q x 1 A D C A B P 2 B E A D C A B P Q B 1 2 3 4 5 6 7 8 9 10 C C A B C C D B C B 1. C |= 2. C 3. A 4. B 5. C A 2 m B n 3 2 n m 3 0 m 0 C 6. C =10 cm 7. D 8. B - m x+h 2 +k=0 m h k x= x m x+h 2 +k=0 m h k x1= 3 x2=2 h = 3 h+ =2 m x+h 3 2 +k=0 x=3 x1=3 3=0 x2=3+2=5 9. C 16 9 a b a b a=b+ a+ =
6、=16 9=7 C b a=b+ a+ = 11. x x 2 12. 5 13. 14 15. 3 16 10 B x h 130+70=200 h=44 B 11. x x 2 x 2 2x=x x 2 x x 2 12. 5 2 3 5 7=8 2 3 5 7 8 5 13. 1 = OAB= = = 14. x A 66 B 60 2 15. 3 OABC=32 OABC O B y ODEF OD=OA = OD=2DE DE=4 OA=8 = OC=AB=4 2 4 M 2 4 y= k= 8 y= x= 8 y= =1 N 8 1 1=3 3 16. PD PC=EC PCE=9
7、0 = DCB BC=DC DCP= BCE DCP BCE DCP BCE SAS DP OM DP BE AOB=30 AB=4=AD DP OM DP= OD= . 17. 1 =3 1+4=6 -5 2 = =a -5 18. -2 -4 -6 19. 1 50 25 15=10 = -3 2 -3 3 3 A B C 1 D 2 E F AB AC AD AE AF BC BD BE BF CD CE CF DE DF EF 15 2 AB AC AD 3 2 P= -4 20. AB= = -4 ABHG -4 21. 1 -5 2 AD F CE=x AC=2x BF DE=2
8、=2 2x 2 + x+ 2 = 2 2 x= x= -5 22. 1 A x x+400 -3 x=1600 x=1600 A 2000 -4 2 7 A m B 50 m y 50 -2 2000 1100 m+ 2400 1400 50 m = 100m+50000 -4 m m=17 A 17 B 33 -6 23. 1 y=0 x 2 2x+3=0 x1=1 x2= 3 A 3 0 B 1 0 x=0 y= x 2 2x+3=3 C 0 3 -3 2 x= 1 M x 0 P x x 2 2x+3 3 x 1 P Q = 1 Q 2 x x 2 2x+3 2 x x= 2 2x PM
9、NQ =2 2 2x x 2 2x+3 = 2x 2 8x+2= 2 x+2 2 +10 -2 x= 2 PMNQ M 2 0 AC y=kx+b A 3 0 C 0 3 AC y=3x+3 x= 2 y=x+3=1 2 1 = 2+3 -4 3 x= 2 Q 0 3 C Q x= 1 y= x 2 2x+3=4 D 1 4 = -2 DQ=2 =4 -3 F t t 2 2t+3 G t t+3 t 2 2t+3 =t 2 +3t 2 +3t=4 t1= 4 t2=1 4 5 1 0 -5 24 1 PD= AD= -4 2 1 A BC AP A D APD ABC AP=5x A P=A
10、D=4x PC=4 5x A P/AB A PC ABC x 41 20 A BC x 41 20 -4 (3) A B AB 6 DH=PA =AD,HE=B Q=EB AB=2AD+2EB=2 4x+2 3x=5 x=5/14 A B =QE PD=x=5/14 A B BC 7 B E=5x DE=5 7x cosB=5x57x=35 x=15/46 A B =B DA D=25/46 A B AC 8 (1) ,x=20/53 A B =PA sinA=25/53 A B AB ,x=14 5 ,A1B1=14 5 -2 A B BC x=46 15 , A1B1=46 25 -1 A B AC x=53 20 , A1B1=53 25 -1
