名校
1 . 如图,在
中,
,给出下列三个结论:①
;②
;③当
时,
.其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc853cb6b385d2f2c215b8acb8c1aced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aeb7d8bfd4877a9bd85b7cc69aec40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d6b98ecb4793c9f063f1f6b61caa19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc849980579cd8b0560d76ba78331ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c898f061882233b9d7315a397bbaaf14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/0d1b03ce-e061-4d09-9365-f2ed0ffcb1d9.png?resizew=142)
A.0 | B.1 | C.2 | D.3 |
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名校
2 . 用4根长度均为1米的铁丝,分别围成下列图形,则面积最大的是( )
A.正方形 | B.正三角形 | C.正六边形 | D.圆 |
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名校
3 . 已知二次函数
(
为常数),当
取不同的值时,其图象构成一个“抛物线系”,图中的实线型抛物线分别是
取三个不同的值时二次函数的图象,它们的顶点在一条抛物线上,这条抛物线的解析式是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e61f6bc2f41da4bf40b3236a0b344b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/b8154ada-0327-48ed-a273-416a6a40c9bd.png?resizew=138)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 如图,在正方形
中,
是
的中点,
在
上,
,连接
、
与对角线
交于点
、
,连接
、
,给出结论:①
;②
;③
;④
其中正确的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330a1dbd5b7700f821750fc8192ec9bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8df5c9bba54641ce3a58d71b47e7bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d34434f252f9347fb29f95346f994f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e062aee40ac4c426fed6ed9c316618d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/681ba23f-3594-4348-ae90-a101c161f83b.png?resizew=135)
A.4 | B.3 | C.2 | D.1 |
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5 . 温州市“瓯海杯”足球联赛有A、B、C、D四个足球队进行循环比赛(即每队都与其他队赛一场),赛了若干场后,由于不小心D队数据被墨水污染,A、B、C三队的比赛情况如下表所示,请推测D队共进了( )个球.
场数 | 胜 | 负 | 平 | 进球 | 失球 | |
A | 3 | 2 | 0 | 1 | 2 | 0 |
B | 2 | 1 | 0 | 1 | 4 | 3 |
C | 2 | 0 | 2 | 0 | 3 | 6 |
D |
A.0 | B.3 | C.6 | D.8 |
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6 . 如图,扇形
的半径为1,圆心角是90°.点
是
上一动点,
于点
,
于点
,点
、
、
、
分别是线段
、
、
、
的中点,
与
相交于点
,
与
相交于点
.
(1)求证:四边形
是平行四边形;
(2)探索当
的长为何值时,四边形
是矩形;
(3)连结
,试说明
是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e17dc84ba2e871aeb3a3fd2a2b5f1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84441c70564cd068d2668085957c3fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee9d78e5383cd018ba74d911c9976bc.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/c75e3040-f073-4a63-8714-ab42ba86db6c.png?resizew=164)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fafaec5283b313a43ab0502280799c.png)
(2)探索当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fafaec5283b313a43ab0502280799c.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb43fd99a100d46d7feecb3edc6397ea.png)
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7 . 如图(1),抛物线
经过
,
两点,并与直线
(
为常数,且
)交于
、
两点,直线
过点
且平行于
轴,过
、
两点分别作直线
的垂线,垂足分别为点
、
.
(1)求此抛物线的解析式;
(2)猜想与证明:
①
______
______
(填“>”“<”或“=”)
②
为______三角形(填“锐角”、“直角”或“钝角”)并证明你的猜想
(3)如图(2)点
为坐标平面内一点,点
是抛物线上任意一点,求
周长最小值,并求出此时
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e335fecc2105f095fe41e8739db935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238f0ea276a00ae8d681ce00cc11c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaef66a0582e95fb5c57a405acdea9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35bf8c29fc8004451de66e12b4de9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/12c91dec-63b2-4907-b4ec-b41b9b0a5f64.png?resizew=176)
(1)求此抛物线的解析式;
(2)猜想与证明:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
(3)如图(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48eced443f5b969c6be558849c7bd8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ab141e7a809aa0f7f46c9df9de2b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/c30b9589-f196-4fe9-a412-6beaac51879c.png?resizew=175)
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8 . 如图,在
中,
,
,
,以其三边为边向外作正方形.点
是
边上的一个动点,连结
,并延长交
于点
,连结
.当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc29330979e64e99678423e58759779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b808b24ca39c5e370bda0b39650a3c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/558a1e4b-df7e-4f83-a436-c434471f69e5.png?resizew=172)
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9 . 小明的爷爷2021年75周岁了,2021年小明的年龄恰好是他出生年份的各位数字之和,问小明2021年可能是多少周岁?
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10 . 如图,在平面直角坐标系中,直线
与x轴交于点A,与y轴交于点C,二次函数
的图像经过A、C两点,与x轴的另一交点为点B.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/124c7490-d08f-432c-9a2c-c67ce5e4745a.png?resizew=298)
(1)求二次函数的表达式;
(2)当
时,二次函数
的最大值为
,求m的值.
(3)如图2,点D为直线AC上方二次函数图像上一动点,连接BC、CD,设直线BD交线段AC于点E,△CDE面积为
,△BCE的面积为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373e940578737a54a51be72e53a31c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/124c7490-d08f-432c-9a2c-c67ce5e4745a.png?resizew=298)
(1)求二次函数的表达式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72b590fbf2b616377e306e1b4aca4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5a8eac848f5075a0cdf46026e5bc40.png)
(3)如图2,点D为直线AC上方二次函数图像上一动点,连接BC、CD,设直线BD交线段AC于点E,△CDE面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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