2024－2025学年第二学期初中毕业班适应性训练
数学参考答案
一、选择题：本题共10小题，每小题4分，共40分。
1.D2.A3.C4.D5.B6.B7.B8.C9.A10.D
二、填空题：本题共6小题，每小题4分，共24分。
1
11.π12.30013.14.x-215.816.18
3
三、解答题：本题共9小题，共86分。
分解：解不等式①得＜2·································································分
17.(8)x2
解不等式②得x??2·········································································4分
所以不等式组的解集是－2≤x＜2·······················································6分
所以它的整数解是－2，－1，0，1·······················································8分
18.(8分)解：?AD∥BC，
??ADB?EBC·······························································2分
在△ADB和△EBC中，
??A?BEC
?
?ADBE
??ADB?EBC
?
?△ADB≌△EBC···························································5分
∴=··········································································6分
∴+=···································································7分
∵AD=BE
∴+=··································································8分
2
2a?1a?1
19.(8分)先化简，再求值：(?1)?，其中a2?1.
aa
2
2a?1a?1
解：(?1)?
aa
2a?1a(a?1)(a?1)
=(?)?·······································································2分
aaa
1