2023北京海淀区初二期末(下)数学试卷及答案.pdf

海淀区八年级数学参考答案 2023.07 一、选择题 （共24 分，每题3 分） 题号 1 2 3 4 5 6 7 8 答案 C B D A C A D D 二、填空题（共18 分，每题3 分） 9 ．110 10．③ 11．4 12．86 13． 4 2 14．左 4 （第一空2 分，第二空1 分） 三、解答题（共58 分，第15 题6 分，每题3 分，16~21 题，每题4 分，21~24 题，每题5 分，24 题5 分，25 题6 分，26 题7 分） 15 ．（1）解：原式 2 5 −2 5 +3 5 ································································2 分 3 5 ．···············································································3 分 （2 ）解：原式 16 − 4 ··········································································4 分 4 − 2 ················································································5 分 2 ．··················································································6 分 16 ．证明：如图，连接AC ，交EF 于点O. ∵四边形ABCD 是平行四边形， BO DO AO C ∴ ， = O . ······················1 分 F C ∵BE DF ， D ∴OB +BE =OD +DF . O B 即FO EO . ···································3 分 A E ∴四边形AECF 是平行四边形. ·············4 分 17 ．（1）如图所示························································································2 分 y 4