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【330254】2018-2019学年湖南省邵阳市邵阳县八年级下期末数学试题(扫描版)

时间:2025-02-08 16:56:02 作者: 字数:3796字

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>



2019年八年级(下)素质教育期末检测题

数学参考答案

一、选择题(本大题共10个小题, 每小题3分,满分30分)

1

2

3

4

5

6

7

8

9

10

D

B

A

C

C

B

A

D

A

B

二、填空题 (本大题共8个小题, 每小题3, 满分24)

11100 12ABCD(或AD=BC), 13x2 140.1

15 k ≠-1 16 24 179 183n+1.

三、解答题(本大题有8个小题,第19-20题每小题6分,第21-22题每小题8分,23-24题每小题9,第25-26题每小题10分,66)

19解: ABC中,A70°CEBF是两条高,
∴∠EBF
90°A90°70°20°ECA90°A90°70°20°.……2

∵∠ BCE30°∴∠ACBBCEECA50°. ……4
Rt△BCF中,FBC90°ACB40°. <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> ∴∠EBF20°FBC40°. ……6

  1. 解:y6x成正比例,

y6kx(k≠0) ……2
x3时,y=-12

126 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 3k.解得k=-2 ……4
∴y
6=-2x函数关系式为y=-2x6. ……6

21.解:(1)200(35704010)45,补全频数分布直方图略. ……2

(2)设抽了x人,则=,解得x8. ……3

(3)依题意知获一等奖的人数为:200×25%50(),则一等奖的分数线是80分. ……3

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>

22解:如图,设大树高为AB=10 m,小树高为CD=4 m

C点作CEABE,则EBDC是矩形. ……2

EB=CD=4 mEC=8 m.

AE=ABEB=104=6 m. ……5

连接AC,在Rt△AEC中, <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>8

  1. 解:(1108 ……2

2180x450 ……2

30.6 ……2

4)设直线BC的解析式为y=kx+b,由图象,得

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 解得 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> y=0.9x-121.5.

y=328.5时,0.9x-121.5=328.5.解得x=500.

答:这个月他家用电500千瓦时. ……3

24. 证明: (1)∵四边形ABCD是平行四边形,ABCDAC.

ABECDF中, <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> ∴△ABE≌△CDF( <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> SAS) …………………… 5

(2) ∵四边形ABCD是平行四边形,ADBCAD∥BC. ∵AECFDEBF.

DE∥BF四边形BFDE是平行四边形. …………4

25. 1四边形ABCD是菱形

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> .

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 的中点, <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> . ∴ <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> .

∴ △ <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 为等边三角形.∴  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> ……5

2)示例四边形 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 是菱形 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>

 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>  <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> .……5

26( <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 1)证明:在DFC中,DFC90°C30°DC <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> 4tDF2t. ∵AE2tAEDF. ……3

(2)能.理由如下:AB⊥BCDF⊥BCAE∥DF.
∵AE
DF四边形AEFD为平行四边形,AEADACDC604t2t.解得t10t10秒时,四边形AEFD为菱形. ……3

(3)①DEF90°时,由(2)EF∥AD ∴∠ADEDEF90°. <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a>
∵∠A
60°ADAEt.AD604t,即604 <a href="/tags/51/" title="试题" class="c1" target="_blank">试题</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/255/" title="学年" class="c1" target="_blank">学年</a> <a href="/tags/982/" title="湖南省" class="c1" target="_blank">湖南省</a> <a href="/tags/1039/" title="邵阳" class="c1" target="_blank">邵阳</a> <a href="/tags/1121/" title="湖南" class="c1" target="_blank">湖南</a> tt. 解得t12. 1

EDF90°时,四边形EBFD为矩形,在Rt△AED中,A60°,则ADE30°
∴AD
2AE,即604t4t,解得t. ……1

EFD90°,则EB重合,DA重合,此种情况不存在.……1
t=秒或12秒时,DEF为直角三角形. ……1