1、 1 1. x m 1 x 2 +5x+m 2 3m+2=0 0 m A.1 B.2 C.1 2 D.0 2. ( ) x 2 +3=0 2x 2 3xy+4=0 x 2 4x+k=0 x 2 +mx 1=0 3x 2 +x=20 A.2 B.3 C.4 D.5 3. 3x 2 4= 2x A.3, 4, 2 B.3, 2, 4 C.3,2, 4 D.3, 4,0 4. x kx 2 6x+9=0 k A.k 1 k 0 B.k 0 C.k 1 D.k 1 5. x m 1 x 2 +5x+m 2 3m+2=0 0 m A.1 B.2 C.1 2 D.0 6. x 2 -6x-4=0 ( )
2、A.(x-6) 2 =-4+36 B.(x-6) 2 =4+36 C.(x-3) 2 =-4+9 D.(x-3) 2 =4+9 7. 3 4 x 2 -10x+21=0 A.14 B.10 C.10 14 D. 8. x 2 4x+3=0 A.5 B.7 C.5 7 D.10 9. 4x 2 +1=4x A. B. C. D. 10. x1 x2 x x 2 +ax 2b=0 x1+x2= 2 x1 x2=1 b a ( ) A. B. C.4 D. 1 11. x x 2 mx m 2 -3m+3 0 m A.1 B.2 C.1 2 D.0 12. x (x 2 3x) 2 2(x 2 3x
3、)-3=0 x 2 3x ( A.1 B. 3 1 C.3 D. 1 3 13. 64 x 2 A.x x+1 =64 B.x x 1 =64 C. 1+x 2 =64 D. 1+2x =64 14. 2013 GDP 2012 12% 2013 7% GDP x% x% A.12%+7%=x% B. 1+12% 1+7% =2 1+x% C.12%+7%=2 x% D. 1+12% 1+7% = 1+x% 215. 200 , 1000 , x, ( ) A.200(1+x) 2 =1000 B.200+200 2x=1000 C.200+200 3x=1000 D.2001+(1+x)+(
4、1+x) 2 =1000 16. M ax 2 +bx+c=0 N cx 2 +bx+a=0 a+c=0 A. M N B. 6 M N C. M N x= 1 D. M N 17. x 2 +x 3=0 0.1 x 1.2 1.3 1.4 1.5 x 2 +x 3 0.36 0.01 0.36 0.75 A.1.5 B.1.2 C.1.3 D.1.4 18. 10 ( ) A.4 B.5 C.6 D.7 19. a b a 2 6a+4=0 b 2 6b+4=0 a b A.7 B. 7 C.11 D. 11 20. x x 1 x 2 =m m 0 A.1 2 B.1 2 C. 1 2 D
5、. 1 2 : 3 21. 1000 1210 % 22. 4 160 6 90 23. _ 24. 3 1980 x _ 25. 50 182 . 26. m n x 2 +6x 5=0 3m+3n 2mn=_ 27. x k 1 x 2 +2x 2=0 k 28. x 2x(kx-4)-x 2 +6=0 , k _. 29. 91. x . 30. 30m 20m ABCD AB AD 78m 2 m xm 31. (2x 1) 2 =(3 x) 232. 3x 2 6x+1=0 33. x 2 1=3x 4 34. a b c x (c b)x 2 +2(b a)x+(a b)=0 .
6、35. x kx 2 4k+1 x+3k+3=0 k 1 2 x1 x2 x1 x2 y=x2 x1 y k 36. x x 2 +2 m+1 x+m 2 1=0 1 m 2 x1 x2 x1 x2 2 =16 x1x2 m 5 37. 24 15 45 AB 38. 28m ABCD AB BC AB=xm 1 192m 2 x 2 P CD AD 15m 6m x S S 6 39. 60 50 a 1 x a= x 2 2430 40. ABC AC=3cm BC=4cm P Q AB BC P A AB B Q B BC C 1cm Q C P P Q t 1 PBQ S(cm 2 )
7、 t(s) t 2 PBQ 3 PBQ ABC 7 1 B 2 B 3 C 4 A 5 B 6 D 7 B 8 B 9 C 10 A 11 B 12 A 13 C 14 D 15 D 16 C 17 C 18 B 19 A 20 D 21 10 22 25% 23 2012 24 x x 1 =1980 25 50+50(1+x)+50(1+x) 2 =182 26 8 27 k k 1 28 2 29 x 2 +x+1=91 30 30 2x 20 x =6 78 31 32 3x 2 6x+1=0 x 1 2 = x 1= x1=1+ x2=1 33 (1) x 2 3x 1 0 a 1
8、b 3 c 1 b 2 4ac ( 3) 2 4 1 1 5 0. x . x1 x2 . 34 35 1 k 0 = 4k+1 2 4k 3k+3 = 2k 1 2 k k 2k 1 0 = 2k 1 2 0 2 y k x= = x=3 x=1+ k 1 1+ 2 3 x1 x2 x1=1+ x2=3 y=3 1+ =2 36 1 =2 m+1 2 4 m 2 1 0 8m+8 0 m 1 m m 1 2 x1+x2= 2 m+1 x1 x2=m 2 1 x1 x2 2 =16 x1x2 x1+x2 2 3x1x2 16=0 2 m+1 2 3 m 2 1 16=0 m 2 +8m 9=0
9、 m= 9 m=1 m 1 m=1 37 1 AB x 24-3x x=45 x1=3 x2=5 x=3 24-3x=15 x=5 24-3x=9 AB 3m 5m 2 24-3x x=-3x2+24x=-3 x2-8x+16-16 =-3 x-4 2+48 AB 4m 12m 48 38 1 AB=xm BC= 28 x m x 28 x =192 x1=12 x2=16 x 12m 16m 2 . S=x 28 x = x2+28x= x 14 2+196 x 14 S x . x=13 S S= 13 14 2+196=195 x 13m S 195m 2 39 1 x a= 2 50
10、2x 60 3x x =2430 x1=2 x2=38 40 PM BC M AC=3cm,BC=4cm, C=90 AB=5 PA=BQ=t PM=sinB PB=3/5(5-t)BM=cosB PB=4/5(5-t) QM=BM-BQ=4-9/5 t PQ= QM +PM = (4-9/5 t) +(3-3/5 t) PBQ BQ=PB 5-t=t, t=2.5 PQ=BQ t= (4-9/5 t) +(3-3/5 t) 13t -90t+125=0 t=25/13, t=5 , PB=PQ 5-t= (4-9/5 t) +(3-3/5 t) t=40/13,(t=0 , ) ,t=2.5 t=25/13, t=40/13 , PBQ .
