已知函数
的图象是一条过原点的直线,且y随x的增大而减小,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442d003daec5a56d059ed46d8d4063e7.png)
更新时间:2018-03-08 23:25:41
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【推荐1】已知y与
成正比例,且当
时,
;当
时,
.
(1)求y关于x的函数表达式.
(2)若
,求x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd082ae3d03818ce505e0994b2710a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bbf68714436abcc9a8fdc01bd04895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107babba45f110012183dc4dc54490f7.png)
(1)求y关于x的函数表达式.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020c68507bbe37105b08d436a3bd02c6.png)
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【推荐2】已知y=y1﹣y2,y1与x2成正比例,y2与x﹣1成反比例,当x=﹣1时,y=3;当x=2时,y=﹣3.
(1)求y与x之间的函数关系;
(2)当x=
时,求y的值.
(1)求y与x之间的函数关系;
(2)当x=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐1】如图1,公路上有
三个车站,一辆汽车从
站以速度
匀速驶向
站,到达
站后不停留,以速度
匀速驶向
站,汽车行驶路程
(千米)与行驶时间
(小时)之间的函数图象如图2所示.
(1)求
与
之间的函数关系式及自变量的取值范围.
(2)汽车距离C站20千米时已行驶了多少时间?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f55724f7ee57bd395eb3b95393c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)汽车距离C站20千米时已行驶了多少时间?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/33a6e5b6-e121-465e-b2e6-a19f3166e11b.png?resizew=375)
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【推荐2】在平面直角坐标系中,
,
,对于任意的实数
,我们称
为点M和点N的k系和点.
例如,已知
,
,点M和点N的2系和点为
.已知
,
.
(2)已知点
,若点B和点C的k系和点为点
.
①求m的值;
②横坐标、纵坐标都为整数的点叫做整点,若点D为整点,且三角形BCD的内部(不包括边界)恰有3个整点,则k的值为__________;
③若三角形BCD的面积为14.求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f88d66ac1654401aad79b33eea0c9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e9ac7c8dd93582e64a9d04c189aeaf.png)
例如,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc44797d05f315cb4ae3967ec32262a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0380affac0c9d6554f5f0774c49f7aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0935f67abcb1fc17058db048d69a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1dab74e16403e8131f9f5b2a74f3a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852b303689c31189cd47bb4a3220f9fa.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/214e3a32cc04c6b9ae02a351ddd81203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345c7a8471230914875e131e4ed0c6db.png)
①求m的值;
②横坐标、纵坐标都为整数的点叫做整点,若点D为整点,且三角形BCD的内部(不包括边界)恰有3个整点,则k的值为__________;
③若三角形BCD的面积为14.求点D的坐标.
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