执笔抒情2009年莆田市初中毕业、升学考试试卷
数学试卷参考答案及评分标准
说明：
（一）考生的解法与“参考答案”不同时，可参照“答案的评分标准”的精神进行评分 （二）如解答的某一步计算出现错误，这一错误没有改变后续部分的考查目的，可酌情给分，
但原则上不超过后面应得分数的二分之一；如属严重的概念性错误，就不给分． （三）以下解答各行右端所注分数表示正确做完该步骤应得的累计分数． （四）评分的最小单位是１分，得分或扣分都不能出现小数． 一、细心填一填（本大题共10小题，每小题4分，共40分．）
2
4．40 5．2 11
1
6．AB BC或AC BD或AO BO等 7．甲 8．相交 9．3 10．
5
1．3 2．4.3 104（不必考虑有效数字） 3． 二、精心选一选（本大题共6小题，每小题4分，共24分．） 11．A 12．B 13．C 14．D 15．A 16．C 三、耐心做一做（本题共9小题，共86分）
17．（1）解：原式
=34 1 ························································································6分
=····································································································8分
1 注：3 32分）
4（2分）， =1（2分）
3
x 2 x 2 x
18.解：原式= ···········································································6分
x 2x 2x 2
=1 x ·······································································································7分 当x 1时原式=1 1 0 ······················································································8分
2
注：x 4x 4 x 2 、x 4 x 2 x 2 、？
2
2
2
x 2x 2
? （各2分） x 2x 2
A 19． （1）①△DOE≌△BOF； ························· 2分
证明：∵四边形ABCD是平行四边形
∴AD∥BC ·········································· 3分 F
C
∴ EDO FBO， E F······························ 4分
（第19题图）
又∵OD OB
∴△DOE≌△BOF AAS ·············································································5分
②△BOM≌△DON ······················································································2分
证明：∵四边形ABCD是平行四边形
∴AB∥CD ······································································································3分
