2014年学业水平考试数学试题参考答案
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2014年学业水平考试数学试题参考答案
一、选择题: 二、填空题:
16. 2014 17. 500 18. a b
a
- 19. 6 20. 6 21. ①②④ 三、解答题:
22.(1)解:原式=2+3-23+1-6 ……………………………………………2分 =-23 …………………………………………………………..3分 (2)解:方程两边都乘以最简公分母(x ﹣3)(x +1)得:
3(x +1)=5(x ﹣3), ………………………………………………4分 解得:x =9, ………………………………………………………….5分 检验:当x =9时,(x ﹣3)(x+1)=60≠0, ……………………….6分 ∴原分式方程的解为x =9. ………………………………………….7分
23.(1)证明:∵AC =BD ,
∴AC +CD =BD +CD ,
即AD =BC . ……………………………………1分 在△ADE 和△BCF 中,
AD =BC
∠A =∠B AE =BF
∴△ADE ≌△BCF (SAS ). ……………………………………2分
∴∠E =∠F . ……………………………………3分 (2)解:∵在Rt △ADB 中,∠BDA =45°,AB =3 ∴DA =3 …………1分
在Rt △ADC 中,∠CDA =60°∴tan60°=
CA
AD …………2分
CA= 33 ………………………………………3分 ∴BC=CA -BA=(33-3) 米 ………………………4分
24.解:设甲种商品应购进x 件,乙种商品应购进y 件. …………1分
根据题意,得 160
5101100.x y x y +=⎧⎨+=⎩
…………5分
解得:100
60.x y =⎧⎨=⎩
………………………………7分
答:甲种商品购进100件,乙种商品购进60件. …………8分
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 A
B
D
C
C
D
B
D
D
B
B
D
A
A
C
25.解:列表得
1 2 3 1 2 3 4 2 3 4 5 3
4
5
6
································································································································· 4分
共有9种等可能的结果,其中摸出的两个小球标号之和是2的占1种, 摸出的两个小球标号之和是3的占2种, 摸出的两个小球标号之和是4的占3种, 摸出的两个小球标号之和是5的占2种, 摸出的两个小球标号之和是6的占1种; 所以棋子走到E 点的可能性最大, ···························································· 7分
棋子走到E 点的概率=31
93=. ······························································· 8分
26.解:(1)90331802
ACB l ππ
=
⨯= …………………….2分 扇形OAB 的周长为362
π
+……………………….3分 (2)连结OC ,交DE 于M ,
∵四边形ODCE 是矩形 ∴OM =CM ,EM =DM ………………….4分 又∵DG =HE
∴EM -EH =DM -DG ,即HM =GM …………………….5分 ∴四边形OGCH 是平行四边形 ……………………………6分 (3)DG 不变; …………………………………………….7分
在矩形ODCE 中,DE =OC =3,∴DG =1 ………………..9分
27.解:(1)CF =EF ························································································· 1分
连接BF (如图①).∵△ABC ≌△DBE ∴BC =BE ,AC =DE
∵∠ACB =∠DEB =90° ∴∠BCF =∠BEF =90°
又∵BF =BF ,∴Rt △BFC ≌Rt △BFE . ∴CF =EF . ··········································································································2分 AF +EF =DE ·········································································································3分 ∵AF +EF =AF +CF =AC 又∵AC =DE ∴AF +EF =DE . ··································································································4分 (2)画出正确图形(可不加辅助线)如图② ·································································5分
AF +EF =DE 仍然成立. ······················································································6分 (3)不成立.此时AF ,EF 与DE 的关系为AF - EF =DE ······································7分
理由:连接BF (如图③),∵△ABC ≌△DBE ,∴BC =BE ,AC =DE , ∵∠ACB =∠DEB =90°,∴∠BCF =∠BEF =90°.
第2次
A O B
C
E
H G D M 第1次