名校
1 . 如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/1bbee780-2485-4c6b-a68f-4b20316880b2.png?resizew=237)
(1)用尺规作图作
边上的中垂线
,交
于点D,交
于点E,再连接
(保留作图痕迹,不要求写作法和证明)
(2)在(1)题的基础上,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d2b8e33814ccbeec94fbfa67e6d321.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/1bbee780-2485-4c6b-a68f-4b20316880b2.png?resizew=237)
(1)用尺规作图作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/d40b319212a7e7528b053e1c7097e966.png)
(2)在(1)题的基础上,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df34369163e511f14028168cb0b21186.png)
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2024-04-05更新
|
208次组卷
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16卷引用:广东省惠州市河南岸中学2021-2022学年九年级下学期开学考试数学试题
广东省惠州市河南岸中学2021-2022学年九年级下学期开学考试数学试题【全国校级联考】广东省汕头市潮南区两英镇2018年中考数学模拟试卷(b卷)【全国校级联考】湖南省邵阳县白仓镇中学2018届九年级中考数学二模试题【市级联考】四川省内江市2018-2019学年八年级第一学期期末考试数学试题2【市级联考】广东省东莞市2019届九年级中考数学二模试题广东省潮州市2019年中考数学模拟试卷(6月份)2020年广东省汕头市龙湖区九年级中考模拟数学试题广东省广州市海珠区南武中学2020-2021学年八年级上学期期中数学试题(已下线)【万唯原创】视图与投影·基础必练(二)四川省内江市隆昌市知行中学2020-2021学年八年级上学期第三次月考数学试题河南省驻马店市新蔡县2020-2021学年八年级上学期期末数学试题(已下线)专题1.40 线段的垂直平分线(知识讲解)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)甘肃省酒泉市肃州区酒泉市第二中学2022-2023学年九年级下学期3月月考数学试题四川省内江市隆昌市知行中学2023-2024学年上学期八年级第三次月考数学试题宁夏回族自治区银川市兴庆区2021-2022学年八年级下学期期末数学试题(已下线)特色题型专练01 尺规作图-备战2024年中考数学考试易错题(江苏专用)
名校
2 . 下面是证明三角形中位线定理的两种添加辅助线的方法,选择其中一种,完成证明.
三角形中位线定理:三角形的中位线平行于三角形的第三边,并且等于第三边的一半. 已知:如图, ![]() ![]() ![]() ![]() ![]() ![]() 求证: ![]() ![]() | |
方法一 证明:如图,延长![]() ![]() ![]() ![]() ![]() ![]() ![]() | 方法二 证明:如图,过![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
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3 . 已知
,
,直线
是过点
的一条动直线(不与直线
,
重合),分别过点
,
作直线
的垂线,垂足为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/ac6c13b5-afd5-445c-b4b2-10b8511246f7.png?resizew=431)
(1)如图1,当
时,
①求证:
;
②连接
,过点
作
于
,过点
作
交
的延长线于点
.依题意补全图形,用等式表示线段
,
,
的数量关系,并证明;
(2)在直线
运动的过程中,若
的最大值为3,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053ac49d8359ba0206384ca0aaf2a911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/ac6c13b5-afd5-445c-b4b2-10b8511246f7.png?resizew=431)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e602010059da4d778792e88aa4e1851.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6dfd63cd67201f12c8983e479127e9.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344067523ee04f5cc546978ca0116e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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4 . 请完成下面的证明.
已知:如图,
,
,
,求证:
.
,
(____________)
∴
(____________)
∴
(____________)
∴
______(____________)
又∵
(已知)
∴
______(____________)
∴
(____________)
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4042e4acd0e823c2a69ce8bee3b995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc051f5bd7ca13c4d3f9c87fa287c0e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36265f69a8d6058b623a070dc7f4ed4c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4042e4acd0e823c2a69ce8bee3b995.png)
您最近一年使用:0次
5 . 已知:如图,在中,
,
,
,
、
交于点
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7894c7a063cfbbc8bf41c30775a69b.png)
(2)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04b73200fbec6a89974c251d680494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04b73200fbec6a89974c251d680494.png)
您最近一年使用:0次
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6 . 完成下面推理过程:
已知:如图,已知
.
求证:
.
,(已知)
_____
_____.(在同一平面内,垂直于同一条直线的两条直线平行)
,(________________________)
又,
,(已知)
________,(等量代换)
.(________________________)
已知:如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146bef0422759a8676f5917271ecbac7.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9cae40253fd13301be23c0f8781561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2c21d7c3888d43e700dedf1161bf50.png)
又,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba51168da9382b9e573fcc4a88b6268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0caac8971608f406021354a107c71218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8644afba5451902a1d517ec584877a.png)
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2024-01-24更新
|
269次组卷
|
3卷引用:福建省泉州市永春第一中学2023-2024学年七年级下学期开学考试数学试题
7 . 如图,
中,
是
上一点,
于点
是
的中点,
于点
,与
交于点
,若
平分
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/d64eac8e-5320-49b1-841b-5fe3dfcf81e7.png?resizew=189)
(1)求证:
;
(2)试探究线段
之间的数量关系,并证明.
(3)若点
为
中点,判断四边形
是什么四边形?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6292a823a01a6e6c33d2b79ae2def3ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62da163eeb58a4d172835b5271c3d3ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/d64eac8e-5320-49b1-841b-5fe3dfcf81e7.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8245bcd9cf3601f5718d095e1f129c86.png)
(2)试探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4815654c4459e82d9fd9c95d050506.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0d543096590fc939259a0ee74d1067.png)
您最近一年使用:0次
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8 . 已知:
是
的高,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/96b1e183-34d8-4c65-840f-af710a9774d6.png?resizew=465)
(1)如图1,求证:
;
(2)如图2,K为
内一点,连接
,且
,求证:
;
(3)如图3,在(2)的条件下,点E、F分别在线段
上,连接
分别交
于点G、H,连接
,若
,试猜想
的度数,请直接写出你的猜想并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e051da5c8aea7ef4a467bfaa07256b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/96b1e183-34d8-4c65-840f-af710a9774d6.png?resizew=465)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(2)如图2,K为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27d300feab3a0c551da20cf2c138db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1d92c1eebdff9c1289c9580bdcb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fac6ad846cf8665550ec291835ee5ab.png)
(3)如图3,在(2)的条件下,点E、F分别在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a454d94256adcda65bc9c89e427a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa24c28f3caf32d6fbaf9a3ca601a2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27d300feab3a0c551da20cf2c138db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4debedd1c381022a5643a572f44660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af469dc21c94d04030d9b4596689e9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
您最近一年使用:0次
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9 . 如图,在平行四边形
中,连接对角线
,
于点E,交
于点G.
的垂线,交
于点F,交
于点H;(不写作法,保留作图痕迹)
(2)在(1)所作的图形中,求证:
.(请补全下面的证明过程)
证明:∵四边形
是平行四边形,
∴
,
,∴
① .
∵
,∴
.
∵
,∴
.
∵ ② ,
∴
,
,即 ③ ,
∴
,∴ ④ ,
∴
,∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)在(1)所作的图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a15346cf93dc605b05f16bfa4eaa2c.png)
证明:∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb663fe83b1f7e93e13d91cc6460f9c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc88122db97e1b88448cdf0594168c3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1070d38d2fea1dc88c6eb31d320b763.png)
∵ ② ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ac96920743ceb96bba967e157360a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce706c90a7d2fb52e4a0b1d0bf16b17f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81361a23e8bfe6e42ca24c2a757750a3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93255435df1aea4e1b60885d5454202e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a15346cf93dc605b05f16bfa4eaa2c.png)
您最近一年使用:0次
2024-04-18更新
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201次组卷
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12卷引用:重庆市巴蜀中学校2022-2023学年九年级下学期数学开学考试试题
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10 . 在
中,
,
,直线
经过点A,且
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/e2eea057-e633-4652-9f95-e148198c3f87.png?resizew=421)
(1)当直线
绕点A旋转到图1的位置时,求证:
;
(2)当直线
绕点A旋转到图2的位置时,试问
,
,
具有怎样的等量关系,写出这个等量关系.并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fbbed1dbff0bdf2de260443749e151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d9b83f3c224fc8e10a46ab71530c2a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/e2eea057-e633-4652-9f95-e148198c3f87.png?resizew=421)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923da78dfab340246826b1afcf8d1edc.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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2024-01-07更新
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3卷引用:福建省福州延安中学2021-2022学年八年级上学期开门考数学试题