如图,四边形ABCD是由四个全等的直角三角形拼成.若四边形ABCD的面积为13,中间空白处的四边形EFGH的面积为1,直角三角形的两条直角边分别为a和b,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/f808f737-2ac1-4002-bb8d-cd205065a721.png?resizew=178)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73535eacf88079e8a713a5454750e51.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/f808f737-2ac1-4002-bb8d-cd205065a721.png?resizew=178)
A.12 | B.13 | C.24 | D.25 |
2022高一·全国·专题练习 查看更多[1]
(已下线)专题03 一元二次方程与二次函数的图象、性质-2022年暑假初三升高一数学衔接知识自学讲义(人教A版2019)
更新时间:2022-06-21 22:31:28
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【推荐1】用120根火柴,首尾相接围成一个三条边互不相等的三角形,已知最大边是最小边的3倍,则最小边用了( )
A.20根火柴 | B.19根火柴 | C.18或19根火柴 | D.19或20根火柴 |
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【推荐2】记方程①:
,方程②:
,方程③:
,其中
,
,
是正实数.当
,
,
成等比数列时,下列选项中,能推出方程③有两个不相等的实根的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7319b374ae72250651fd94a404165ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c8d29c5ac6ff8898e77d17fad41b88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b3ea1975024033bf77e5be2248b33e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
A.方程①有实根,且②有实根 |
B.方程①有实根,且②无实根 |
C.方程①无实根,且②有实根 |
D.方程①无实根,且②无实根 |
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【推荐1】图2是图1中长方体的三视图,若用
表示面积,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47e23642c284a050776e68bc34c4d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a24414fb5b9250543b80542d57f483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b23749bf308389ab21a1810ea99bec7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/de50fca8-df70-488a-b5a4-fbd56f5fff40.png?resizew=258)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图所示的衣架可以近似看成一个等腰三角形
,其中
,
,
cm,则高
约为( )
(参考数据:,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc5db7ac344c05465dbabcc5e3d696.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/32523c5b-66bf-415a-8e09-334af3311b38.png?resizew=223)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1816fb0bed72025e79aa4b7185055ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a5dae3b3a443748604b79401616239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c6cf2f16410d7602d14c320bb80bc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(参考数据:,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae2f44d211b6cef769061ef0e7bf45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc5db7ac344c05465dbabcc5e3d696.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/32523c5b-66bf-415a-8e09-334af3311b38.png?resizew=223)
A.22.44cm | B.9.90cm | C.11.22cm | D.19.58cm |
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