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【330253】2018-2019学年湖南省邵阳市邵东县八年级下期末数学试卷( 图片版,有答案和答题卡

时间:2025-02-08 16:55:54 作者: 字数:3373字

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 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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>




2019年上学期期末质量检测试卷

八年级数学参考答案

一、选择题: 15DDBAC 6-10ACADB

二、填空题: 11 12 13135 14、(04

155 163 173 1811

三、解答题

19解:∵AD是∠BAC的平分线,∠CAB60°,∴∠CAD=∠CAB30°

∵∠C90°,∠CAB60°∴∠B30°AD=BD=2,∵∠CAD30°,∴CDAD1

20位置关系是:DEBF ,数量关系是: DEBF

证明:∵四边形ABCD是平行四边形∴ADBCADBC

∴∠DAC=∠ACB,且AECFADBC∴△ADE≌△CBFSAS

DEBF,∠AED=∠BFC∴∠DEC=∠AFB DEBF

21证明:(1)如图,∵四边形ABCD为菱形,∴∠COD90°;而CEBDDEAC

∴∠OCE=∠ODE90°,∴四边形CODE是矩形.

解:(2)∵四边形ABCD为菱形,∴AOOC <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> AC3ODOB,∠AOB90°

由勾股定理得:BO2AB2AO2,而AB5,∴DOBO4

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> 四边形CODE的周长=2 ×3+4)=14

22解:(1a5048161012

2)根据题意画图如右图:

3)本次测试的优秀率是 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ×100%44%

答:本次测试的优秀率是44%

23、(1)解:正确画出图(4分)

D(﹣21)(6分)

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> 2)解:AC <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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>3 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,(8分)

24解:(1)由题意得:x+3x+7+y100,所以y934x

2W80x+1203x+7+150934x)=﹣160x+14790

3)依题意得 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,解得20x22,因为整数x202122

所以共有3种购票方案

方案一:A20B67C13;方案二:A21B70C9;方案三:A22B73C5

w=﹣160x+14790,因为k=﹣1600,所以Wx的增大而减小,

所以当x22时,W最小22×(﹣160+1479011270

即当A种票为22张,B种票73张,C种票为5张时费用最少,最少费用为11270元.

25解:(1)猜想:OEOF,理由如下:

MNBC,∴∠OEC=∠BCE,∠OFC=∠GCF

又∵CE平分∠BCOCF平分∠GCO,∴∠OCE=∠BCE,∠OCF=∠GCF

∴∠OCE=∠OEC,∠OCF=∠OFC,∴EOCOFOCO,∴EOFO

2)当点O运动到AC的中点时,四边形AECF是矩形.

当点O运动到AC的中点时,AOCO,又∵EOFO,∴四边形AECF是平行四边形,

FOCO,∴AOCOEOFO,∴ ACEF,∴四边形AECF是矩形.

3)当点O运动到AC的中点时,且△ABC满足∠ACB为直角的直角三角形时,四边形AECF是正方形.

由(2)知,当点O运动到AC的中点时,四边形AECF是矩形,

已知MNBC,当∠ACB90°,则∠AOF=∠COE=∠COF=∠AOE90°

ACEF,∴四边形AECF是正方形.

26解:(1)把AB两点代入,得 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,解得: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,故直线AB的函数解析式为yx+2

 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> 2)令yx+2=0x= -2,∴C-20

又∵ <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,得CD6,∴D点坐标(40),

由图象得不等式的解集为

3)作点B关于x轴的对称点E0,﹣2),连接AEx轴于点M

设直线AE解析式为 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,则 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,解得: <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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>

y5x2,当y0时,x <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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> ,故点M的坐标为 <a href="/tags/46/" title="答案" class="c1" target="_blank">答案</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</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>