1 . 若正多边形的一个外角是
,则该正多边形的内角和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如图:在平行四边形
的边
,
上截取
,
,使得
,连接
,点
,
是线段
上两点,且
,连接
,
.
(1)求证:
;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a74fa1d77910529e4eda3b2d70f40a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/55e0d838-89da-4cfa-9dda-8e4e571d1bda.png?resizew=225)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c883ea424e7bc9db19d5e35a6ec63134.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760d7546f3f4f788eabf9c493fcdc867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f898fd9009607f692cddda426d179427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb22ca5b9cdfeebca14bdfad0b8f29.png)
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3 . 一商店在某一时间以每件120元的价格卖出两件衣服,其中一件盈利20%,另一件亏损20%,在这次买卖中,这家商店( )
A.不盈不亏 | B.盈利20元 |
C.亏损10元 | D.亏损30元 |
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4 . 先化简,再求值
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b369c8bb5c7b6a6dcafbe0634f806736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3053399d2f91ca2f7dda29e7c5d64397.png)
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5 . 甲、乙两船从相距
的A、B两地同时出发相向而行,甲船从A地顺流航行
时与从B地逆流航行的乙船相遇,水流的速度为
,若甲、乙两船在静水中的速度均为
,则求两船在静水中的速度可列方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5167ec8605a15265d019fb1c718adf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8923ce4e8da8b7a2652d6f983fe2b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d455702795935f9f9b4cab567be2f4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c374e788e84cbfee7e2ed8e736dc73.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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6 . 若分式
的值为0,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6fb9b131af49fc98eba537f7c980ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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7 . 今年“五一”假期,我市某主题公园共接待游客77800人次,将77800用科学记数法表示为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 如图,
是
的中位线,若
,则
的长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/41534aa3-a5b8-4172-b255-faf244e61bb3.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/41534aa3-a5b8-4172-b255-faf244e61bb3.png?resizew=162)
A.3 | B.4 | C.5 | D.6 |
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9 . 如图,已知
的圆心角
,则圆周角
的度数等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/6690e381-2274-41ec-bd1b-429a86e85689.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed1c48e0e6ebc02c796817a1e08183c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/6690e381-2274-41ec-bd1b-429a86e85689.png?resizew=159)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 如图,过点
作直线
其依据是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/c7b738fa-241a-420a-9e0f-21f9b1e2ecda.png?resizew=200)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d620f242099d9e5e3225115c80d9bfa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/c7b738fa-241a-420a-9e0f-21f9b1e2ecda.png?resizew=200)
A.两直线平行,同位角相等 | B.两直线平行,同旁内角互补 |
C.同位角相等,两直线平行 | D.内错角相等,两直线平行 |
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