(1)小明同学在研究二次三项式
时,对其进行了配方,思路为
,从而他得出二次三项式
的最大值为 .
(2)如图①,在等边
中,点D、E分别在
和
上,
,
,且
,求
的长.
(3)如图②,在
中,
,点D、F、G、E分别在
、
和
上,且
,设
为x,请用含有x的式子表示四边形
的面积,并探究其有无最值?如果有,求出这个最值;如果没有,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ada629dc4462bbdf5f7759f3c5bb875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ea22ceb22e8f490a2a3cfca841565f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ada629dc4462bbdf5f7759f3c5bb875.png)
(2)如图①,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d40d5cb59338d3cb1dd504bb12d107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853d227ea1d482ae6db2f45b2df0b17e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3399966c1616137d4f676713a0ae8851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a673e131595980d6a43f5ea5f9cc80ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/b71630a2-228b-48a9-99c1-31fd8c377242.png?resizew=364)
22-23九年级上·陕西西安·期中 查看更多[5]
陕西省西安市碑林区西北工业大学附属中学2022-2023学年九年级上学期期中数学试卷 陕西省西安市碑林区2022-2023学年九年级上学期期中数学试题 (已下线)2023年陕西省延安市中考数学第一次模拟考试卷变式题21-26题陕西省西北工业大学附属中学2022-2023学年九年级上学期期中数学试题陕西省西安市碑林区西工大附中2022-2023学年九年级上学期期中数学试题
更新时间:2022-12-10 19:30:17
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解答题-计算题
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较难
(0.4)
【推荐2】(1)计算:6
-5
-
+3
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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(2)计算:(
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(3)解方程:x2+4x-2=0.
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解答题-证明题
|
较难
(0.4)
【推荐1】如图所示,在等边
中,点
为
的中点,点
为
的中点,点
为
的中点,
为
上任意一点,
为等边三角形.求证:
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】(1)如图1,已知:在
中,
,直线l经过点A,
直线l,
直线l.垂足分别为点D、E.证明:
.
(2)如图2,将(1)中的条件改为:在
中,
,D、A、E三点都在直线l上,并且有
,其中
为任意锐角或钝角.请问结论
是否成立?如成立,请你给出证明:若不成立,请说明理由.
(3)如图3,过
的边
、
向外作正方形
和正方形
,
,
,
,
,探索
与
的面积之间有什么关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40975f7553d8cfa57951b568bae9c464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb773a664fa72fc5d8fe377e9f891901.png)
(2)如图2,将(1)中的条件改为:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cf8edbd31ff7e27c784c8688b537a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb773a664fa72fc5d8fe377e9f891901.png)
(3)如图3,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5994db5c8f696312fa71cbef7cc0885c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adffe43abed2d65029d28b17e6d8fe68.png)
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解答题-证明题
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较难
(0.4)
真题
【推荐3】已知,如图,在平面直角坐标系中,点A坐标为(-2,0),点B坐标为 (0,2 ),点E为线段AB上的动点(点E不与点A,B重合),以E为顶点作∠OET=45°,射线ET交线段OB于点F,C为y轴正半轴上一点,且OC=AB,抛物线y=
x2+mx+n的图象经过A,C两点.
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/55978078e2664c2f9cd4be07088b4024.png)
(1) 求此抛物线的函数表达式;
(2) 求证:∠BEF=∠AOE;
(3) 当△EOF为等腰三角形时,求此时点E的坐标;
(4) 在(3)的条件下,当直线EF交x轴于点D,P为(1) 中抛物线上一动点,直线PE交x轴于点G,在直线EF上方的抛物线上是否存在一点P,使得△EPF的面积是△EDG面积的(
) 倍.若存在,请直接写出点P的坐标;若不存在,请说明理由.
温馨提示:考生可以根据题意,在备用图中补充图形,以便作答.
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/1e17276c9af54c9b8f14397261baf9b6.png)
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/55978078e2664c2f9cd4be07088b4024.png)
(1) 求此抛物线的函数表达式;
(2) 求证:∠BEF=∠AOE;
(3) 当△EOF为等腰三角形时,求此时点E的坐标;
(4) 在(3)的条件下,当直线EF交x轴于点D,P为(1) 中抛物线上一动点,直线PE交x轴于点G,在直线EF上方的抛物线上是否存在一点P,使得△EPF的面积是△EDG面积的(
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/aca14b76715e4966a3ffd044db77726a.png)
温馨提示:考生可以根据题意,在备用图中补充图形,以便作答.
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解答题-证明题
|
较难
(0.4)
【推荐1】已知:如图,点E为□ABCD对角线AC上的一点,点F在线段BE的延长线上,且EF=BE,线段EF与边CD相交于点G.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492418718605312/2493737354608640/STEM/89273c2388c74018991145d7e8817fbb.png?resizew=273)
(1)求证:DF//AC;
(2)如果AB=BE,DG=CG,联结DE、CF,求证:四边形DECF是矩形.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492418718605312/2493737354608640/STEM/89273c2388c74018991145d7e8817fbb.png?resizew=273)
(1)求证:DF//AC;
(2)如果AB=BE,DG=CG,联结DE、CF,求证:四边形DECF是矩形.
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解答题-问答题
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较难
(0.4)
名校
解题方法
【推荐2】综合探究
如图,在平面直角坐标系中,点O为原点,
的顶点B、C在x轴上,A在y轴上,
,直线
分别与x轴、y轴、线段
、直线
交于点E、F、P、Q.
时,求证:
.
(2)探究线段
、
之间的数量关系,并说明理由.
(3)在x轴上是否存在点M,使得
,且以点M、P、Q为顶点的三角形与
相似,若存在,请求出此时t的值以及点M的坐标;若不存在,请说明理由.
如图,在平面直角坐标系中,点O为原点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54efc4116b6cb296d55892a21e0d797f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152d5b8ea15cff23e4cee6dd441a0227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d743abf1cfa306b83ff6f0db87ba415.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d057c8a707abd8d2e07e3b0fbbf8b81.png)
(2)探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(3)在x轴上是否存在点M,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a34b6cc0075d4aaae12982543091dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
您最近一年使用:0次
【推荐3】下面是某数学兴趣小探究用不同方法作一角的平分线的讨论片段.请仔细阅读,并完成相应的任务.
任务:
(1)小明得出
的依据是 .(填序号)
①
;②
;③
;④
;⑤
.
(2)小军作图得到的射线
是
的平分线吗?请判断并说明理由;
(3)如图3,已知
,点
,
分别在射线
,
上,且
.点
,
分别为射线
,
上的动点,且
,连接
,
,交点为
,当
时,直接写出线段
的长.
小明:如图1,(1)分别在射线![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 由作图, ![]() ![]() ![]() ![]() ![]() ![]() ![]() 小军:我认为小明的作图方法很有创意,但是太麻烦了,可以改进如下,如图2.(1)分别在射线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() …… ![]() |
(1)小明得出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59a5422948c87213592a861800f0d8c.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbfd199e0ba3e1ec7016a44454e7a3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec76570a0ddc83c103a4b77589d80701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9970629e91021aa64fb871c83746418c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2ba04decd9d9204ec64d567af55721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c56ffc1f3244957d01e53013868fa76.png)
(2)小军作图得到的射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(3)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83f4fd386a2c85261879e6bd959bd1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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