初二下学期期末测试

1、 2012-2013 3 30 123456789101. A.ba=b2a2 B.-a+ba-b=-1 C.a+ba+b=0 D.0.1a-0.3b0.2a+b=a-3b2a+b2. aa-2-aa+24-a2a A.-4 B.4 C.2a D.-2a3. y=kx -1,2 k A.-12 B.12 C.-2 D.24. y=kx+k y=kxk0 5. x1,-1,x2,-254,x3,-25 y=-13 A.x1x2x2x3 C. x1x3x2 D. x1x3x26. A.1.5,2,3 B.7,24,25 C.6,8,10 D.9,12,157. a A. a2 B. 32a C.

2、33a D.233a8. 1 2005 A. 122003 B.122004 C.122005 D.122006 9. ABCD BEAD,BFCD,E,F AE=ED, EBF=( )A. 750 B. 600 C. 500 D. 45010. 6060 149151 191110 136136 150 A. B. C. D. 2 40 11. 2x 12x2y-3xy2 -12 23+a m+n6 aa12.RtABC AC=3,BC=4 AB CD= 13.x= 1x-7 14. x1,x2,x3,x4,x5 x, s2 x1+3,x2+3,x3+3,x4+3,x5+3 15. ABCD

3、 20cm, O ABO OBC 2cm,BC= 16. m= y=x1-2m 17. Ax1,y1,x2,y2 y=6x x1x2=-3 y1y2 18. x-1x=1 x2+1x2=( )19. 4,3,4,4,2,4,7 20. ABCDAD/BC,AC BD BC=7cm,AD=3cm,BD=( )21. ABCD AB=3,AD=4,PAD PEAC,PFBD E,FPE+PF ( ) 22. 5:12:13 60cm 23. a b 24. a-bb-cc-aa-cc-bb-a=( )25. x mx+2+m-1x-2=1-mx2-4 m ( )26. y=mx+2n y=3n+m

4、x 12,2 x y ( )27. 8 6 m 6 48 28. aa-1-2a2-11-1a+1 2x+1-31-x=51-x229. x-2x-3x-2 x x 30. y=m-1xm2-2 m 31. y=y1+y2,y1x y2 x2 x=2x=3y 19. yx x=-6 y 32. 10 7,8,6,8,6,5,9,10,7,4; 9,5,7,8,6,8,7,6,7,7; 33. ABCD AE=BF=CG=DH EFGH 34. ABCD 103+62 , AB 53 ,DEABE DFCBCB F DE 3 C DF 8 35. a,b,c a-52+b-12+c2-26c+169=0 36. y=k2x y=kx-1 a,b,a+1,b+2 A -12 A y=2x-1 x p AOP p 37. 180km 1.5 40