已知关于
,
的方程组
,
为常数.
(1)求
用含
的式子表示
;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945b9c28b44284e0bfe5ceb9ac2b7808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285912b40e1dce8bfc029df88115c961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a5bf27bd64c9d9fabdbe90442d39d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
21-22七年级下·福建厦门·期中 查看更多[2]
更新时间:2022-08-17 16:59:22
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】请阅读求绝对值不等式
和
的解集过程.对于绝对值不等式
,从图1的数轴上看:大于
而小于
的绝对值是小于
的,所以
的解集为
;对于绝对值不等式
,从图2的数轴上看:小于
而大于
的绝对值是大于
的,所以
的解集为
或
.
的解集.
(2)已知关于x,y的二元一次方程组
的解满足
,其中
是负整数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783ad85392ed8970971d792bda932ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1589967a851c99c19ad01887c60139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783ad85392ed8970971d792bda932ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbf80cb71406fd14621139149f7ed9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783ad85392ed8970971d792bda932ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87414b6232c807b9c2e7f631706502d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1589967a851c99c19ad01887c60139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1589967a851c99c19ad01887c60139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95891a56ac10af7f5634b83a6d82c87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a535e901597d8808f97279c6cef3fdf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/534a45f1e0fe71ef37e5408beaed0887.png)
(2)已知关于x,y的二元一次方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/717f31fefd8ef94f45acfe6e3bb99f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49406638adc1247a7eb6df742209d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知数轴上有理数m所表示的点到表示3的点的距离为4个单位长度,a、b互为相反数,且都不为0,c、d互为倒数,求:2
2
(-1-3
)-m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a05fb3956c5995911e4fc40eca1ff0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5febde59a5b5f32fb769e818c2883932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e4088fde3a08197a687197d6d9ed4d.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐3】已知点
,
在数轴上分别表示有理数
,
,
,
两点之间的距离表示为
,当
,
两点中有一点在原点时,不妨设点
在原点,如图1,
,当
,
两点都不在原点时:
①如图2,点
,
都在原点右边,
;
②如图3,点
,
都在原点左边,
;
③如图4,点
,
在原点两边,
.
综上所述,数轴上
,
两点之间的距离表示为
.
回答下列问题:
(1)数轴上表示2和5的两点之间的距离是______
(2)数轴上表示
和
的两点之间的距离是______
(3)数轴上表示
和5的两点之间的距离是______(以上三个空填数值)
(4)若数轴上表示
和
的两点
,
之间的距离为3,求
的值.
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.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/3f4dfec890cdfdda355e19463f3be813.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdb7860ac5286a7a8b8d435c1ecc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①如图2,点
![](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/de837eb8d6211ce9430a60f1af6b886a.png)
②如图3,点
![](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/0f33d0aa85cba0987e287e8920156c50.png)
③如图4,点
![](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/d329b860b249c2211a7f2c034469300a.png)
综上所述,数轴上
![](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/99b60a6e9515c220c8554719e399ec47.png)
回答下列问题:
(1)数轴上表示2和5的两点之间的距离是______
(2)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
(3)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(4)若数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0678cebfe1ecf5f823c25b68c2a5446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bedd2997416e1ee39421d40d1940cc1.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/665d968b-6720-4282-83cc-296574b9e3f7.png?resizew=420)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如果实数a,b满足a2﹣4a+4+
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(1)求a,b的值;
(2)若a,b恰为等腰△ABC的两边长,求这个等腰三角形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68acc849b476aed5013c554913974b38.png)
(1)求a,b的值;
(2)若a,b恰为等腰△ABC的两边长,求这个等腰三角形的面积.
您最近一年使用:0次