一长方形足球训练场的长为x米,宽为60米,如果它的周长大于310米,面积小于6480平方米,则x的取值范围是__________ .
21-22八年级上·浙江杭州·期末 查看更多[2]
更新时间:2023-03-30 13:00:46
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【知识点】 一元一次不等式组应用解读
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【推荐1】已知甲乙两地相距600km,一辆小型客车上午8时从甲地出发,前往乙地,需在当天14点至15点30分间到达乙地,则其行驶平均速度v的取值范围为 _____ .
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【推荐2】对非负实数
“四舍五入”到个位的值记为
,即当
为非负整数时,若
,则
,如
,
,给出下列关于
的结论:
①
;
②
;
③若
,则实数
的取值范围是
;
④当
,
为非负整数时,有
;
⑤
;
其中,正确的结论有_________ (填写所有正确的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2efc4b458ea20c1acca4317505e9fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692f19277572dc695f32be2f6b683c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0e5caa2e092b270af84632d1d20f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedf029acacca6b9c16211f62a873210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c533e0e6838860f545bcb721edb94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2efc4b458ea20c1acca4317505e9fd2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba08c696fd977b6bdcaad20f0dbecef.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c5c9325dde0e927cb25b0d0960d5e2.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35ccc32aa3b95c885dbd1e08b65f721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bffac786d09cc08ab9375dcf678f318.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6e0283201ddb8510960a698cfe7f16.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5fbfa8b3e91d006d0b2dc6cf13aeac8.png)
其中,正确的结论有
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