安阳市2014—2015学年上八年级数学期末试题答案.pdf

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安阳市2014—2015学年上八年级数学期末试题答案.pdf

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2014-2015 学年第一学期教学质量抽测试题八年级数学参考答案及评分意见一、选择题(每小题2 分，共16 分) 题号 1 2 3 4 5 6 7 8 答案 B D A C B C D D 二、填空题(每小题3 分，共21 分) 9. 9 10. 1; 11. 5; 12. 8 ; 13. 3(x  y )2 ; 14. 3; 15. 18; 三、解答题(本大题共8 个小题：16、17 每题6 分；18 题7 分、19、20、21 每题8 分；22 题10 分；23 每题10 分；共63 分) 2 2 16．解：原式=4 （x +2x+1 ）－（4x －25 ）···················································3 分 2 2 =4 x +8x+4 －4x ＋25 ·······································································5 分 =8x ＋29 ． ······················································································6 分 17. 解：方程两边乘(x 2) ，得 x (x  2 ) = (x 1) ． ···································································2 分解得 x 1 ． ·············································································4 分检验当x 1时，x 2  0 ．··························································5 分所以，原分式方程的解为x 1 ． ·······················································6 分 (a  2)2 a (a  2) 18.解：原式  ···················································3 分 (a  2)(a  2) 2 a a ．···············································································5 分 ∵要使原式有意义，a 的值不能取-2、0、2 ．···········································6 分 ∴当a 1时，原式 1． ····································································7 分 19.解：（1）D(-2 ，3)、E （-3，1）、F （2 ，-2 ）············································3 分图略. ································································································5 分（2 ）设E （3,3 ），D （3，-2 ），则 1 1