2024北京平谷初二（下）期末数学（教师版）.pdf

北京市平谷区2024年初二数学

数学试卷参考答分标准

2024.6

一、选择题（本题共16分，每小题2分）

题号12345678

答案CBDCABCA

二、填空题（本题共16分，每小题2分）

9.x−2；10．-3；11．AE=CF；（答案不唯一）12．m4；

2

s22501+x72−2,42,0−6,0

13．s；14.()；15．516．()()()．

甲乙

68171018-25526-28

三、解答题（本题共分，第题分，第题，每题分，第题

617.2

每小题分）解答应写出文字说明、演算步骤或证明过程x−6x+8=0

1

（）

由于a=1，b-6，c8

22

b−4ac=−6−4184············································3

()

2−−62

−bb−4ac()

x==

2a2

x1=2,x2=4·····························································5

(2)x(2x−5)4x=−10

2254

x−x=x−10

2x2−5x−4x+10=0····················································3

2x2−9x+10=0

(2x−5)(x−2)=0

5

x1,x22·····························································5

2

18.(1)补全图形.1分

(2)证明:∵OA=OB,OC=OD,

∴四边形ADBC为平行四边形.(对角线互相平分的四边形是平行四边形)······2

∵OA=OB=OC=OD,即AB=CD,

∴四边形ADBC为矩形.(对角线相等的平行四边