1 . 某体育用品商场销售
两款足球,售价和进价如表:
若该商场购进5个
款足球和12个
款足球共需1120元;若该商场购进10个
款足球和15个
款足球共需1700元.
(1)求
和
的值;
(2)已知商场购进10个
款足球和20个
款足球,售货员说:“每个
款足球按售价进行打折销售,
款足球不打折”.若两款足球全部售出后总盈利不少于640元,则每个
款足球最多打几折?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
类型 | 进价(元/个) | 售价(元/个) |
A款 | m | 120 |
B款 | n | 90 |
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)已知商场购进10个
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2 . 一辆客车从甲地驶往乙地,同时一辆轿车从乙地驶往甲地.两车之间的距离s(千米)与行驶的时间x(小时)之间的函数关系如图所示,已知轿车速度是90千米/时,客车速度是60千米/时,设点A的横坐标为
,点C的横坐标为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d57defe744d41d3e98944294aa36b1.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d57defe744d41d3e98944294aa36b1.png)
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3 . 函数
中自变量x的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4c71d2856a872154ad1d97a16f5308.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() |
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4 . 若关于x的不等式
的解集为
,则m的取值范围是 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca4b1caa3ec646ad0cbb48d9d358372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d1f67d437e4d44af9568eed76fab62.png)
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5 . 因式分解:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd71f78af2e26cb8d3f675ec1ad0a85.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f69a092df0b0f2a4ea1f9674eb0eb08.png)
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名校
6 . 《九章算术》是我国古代第一部数学专著,书中记载了这样一个问题:“今有上禾三秉,益实六斗,当下禾十秉.下禾五秉,益实一斗,当上禾二秉.问上、下禾实一秉各几何?”其大意是:今有上等水稻3捆,加稻谷6斗,与下等水稻10捆相当.下等水稻5捆,加稻谷1斗,与上等水稻2捆相当.问上等水稻、下等水稻每捆各有稻谷多少斗?设上等水稻每捆有稻谷
斗,下等水稻每捆有稻谷
斗.则可列方程组( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 如图1,
,
平分
,且交
于点
,
平分
,且交
于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
是菱形;
(2)如图2,若
交
于点
,且
,
,求菱形的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad42baaa20cf7e40a340a2cf2b545e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf66bee4cb286d06b4f25ede08a6db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d4dbbc3ddd84bed9272b210b620dbc.png)
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名校
8 . 如图,已知
,按以下步骤作图,如图1~图3.
则可以直接判定四边形
是菱形的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(1)以点A为圆心,任意长为半径作弧,与![]() | (2)分别以点B,D为圆心,![]() | (3)分别连接![]() ![]() |
|
|
|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.一组邻边相等的平行四边形是菱形 | B.对角线互相垂直平分的四边形是菱形 |
C.对角线互相垂直的平行四边形是菱形 | D.四条边相等的四边形是菱形 |
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9 . 如图,在每个小正方形边长均为1的方格纸中,每个小方格的顶点叫做格点.
中
边上的中线
;
(2)画出
向右平移3个单位长度后得到的
;
(3)图中
与
的关系是__________;
(4)试在图中找出一个格点
,使得
.(画出一种即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(3)图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
(4)试在图中找出一个格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd80519dc4602cae7378e371acbce8f4.png)
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10 . 因式分解:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cc24cbed4a9a6346d4fc8b7b872265.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d7ccff08ba71c9613cf9cf1a591c73.png)
(3)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cc24cbed4a9a6346d4fc8b7b872265.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d7ccff08ba71c9613cf9cf1a591c73.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8086fe1068d3244f2693f9f63a5c8d.png)
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