如图所示,在直角
中有一内接正方形
,它的一条边
在直角
的斜边
上,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efd363abedb20d3c8d395e7ed11c681.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/603cacbe-5162-4232-8cba-15e0366989d7.png?resizew=189)
(1)用
和
表示出
的面积
和正方形
的面积
;
(2)当
变化时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efd363abedb20d3c8d395e7ed11c681.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/603cacbe-5162-4232-8cba-15e0366989d7.png?resizew=189)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92cd169360ffdb827d40f3dbc7c7ad1.png)
更新时间:2019-12-07 08:56:33
|
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,某网络信息交换系统一天监测瞬时信息流量变化情况近似满足函数
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/fe60a321-7304-41ff-a9d3-ac35b32c783d.png?resizew=192)
(1)求出
,
,
,
的值,写出这段曲线的函数解析式;
(2)若瞬时流量超过
,则该网络系统会拥堵,求一天中该网络会有多长时间出现拥堵.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7184ed9d02ba42d75f14d89bf6579a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d653a41c42961f7ba387daacf7f465.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/fe60a321-7304-41ff-a9d3-ac35b32c783d.png?resizew=192)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若瞬时流量超过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570d97731687dc2232d962ffc9352457.png)
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【推荐2】如图,有一张半径为1米的圆形铁皮,工人师傅需要剪一块顶角为锐角的等腰三角形
,不妨设
,
边上的高为
,圆心为
,为了使三角形的面积最大,我们设计了两种方案.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/70a389bf-a521-46a3-833a-07aaa44cf533.png?resizew=144)
(1)方案1:设
为
,用
表示
的面积
; 方案2:设
的高
为
,用
表示
的面积
;
(2)请从(1)中的两种方案中选择一种,求出
面积的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/70a389bf-a521-46a3-833a-07aaa44cf533.png?resizew=144)
(1)方案1:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c3ca226db5d490fa92bb1b7c8deb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe3c32177de03f8413f85d4a16ff647f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713f4297964e41a7410caaa74a2d5385.png)
(2)请从(1)中的两种方案中选择一种,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】椭圆
的中心在原点
,焦点在
轴上,离心率
,直线
交椭圆
于点
、
,满足
,其中,定点
.当
取得最大值时,求椭圆
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0113329129e93e14f7e115ef54f3d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.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/d04d824fc2ba8ef1371363cc09575e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2f117dc9adcb8fa7acf25bd2cbf283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
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【推荐2】在
中,已知
,
,对角线
与
交于点
,且
,记直线
与
的距离为
.求
的表达式,并写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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