对非负实数x“四舍五入”到个位的值记为
,即当n为非负整数时,若n-
≤x<n+
,则
=n.如:
,
,……根据以上材料,解决下列问题:
(1)填空
= ,
= ;
(2)若
,则x的取值范围是 ;
(3)求满足
的所有实数x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9004626d2ec5a7d20902c35bfed9cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1354d575fca36972ab91cb2beebbc2a5.png)
(1)填空
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336b3192e6bc5502408516a9a06f9f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f398f13ab921ef4eadd919a8bcc1b337.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d3a5a2e3d3a8e63cdaca9da035a618.png)
(3)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b70c44f80ae91642cb9b7f47e8e00d6.png)
更新时间:2019-08-20 18:29:56
|
相似题推荐
解答题-问答题
|
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(0.4)
【推荐1】记
表示正数x四舍五入后的结果,例如![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a79a79f6f7e65adf35c2f1ebca8f7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
(1)
=_ ,
=
(2)若
,则x的取值范围是 .
(3)若
则x的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436a25a5007b4f98262f8e8311e6acfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a79a79f6f7e65adf35c2f1ebca8f7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44402cefbe2151d310d37963f8c8ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a650240f314945a9ed5c5b0ddd50d7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6122f9a7e9a8b9b8fcf07632e8c79755.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dbe21a7c48b459fde0e330e8a0d3a72.png)
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【推荐2】对x,y定义一种新运算T,规定:T(x,y)=
(a、b均为非零常数),这里等式右边是通常的四则运算,例如:T(0,1)=
=b.若
.
(1)求a,b的值.
(2)解关于m的不等式:T(2m,3–4m)≤8.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a6095833a3fbb6bf2afa86d6e7479f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a759b8677516d34156af5afa968bff54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341d8a1659dd209efa8a195372ed4915.png)
(1)求a,b的值.
(2)解关于m的不等式:T(2m,3–4m)≤8.
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解答题-问答题
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较难
(0.4)
【推荐1】对非负实数x“四舍五入”到个位的值记作<x>,即:当n为非负整数时,若n-
≤x<n+
,则<x>=n.如:<0>=<0.48>=0,<0.64>=<1.493>=1,<2>=2,<3.5>=<4.12>=4,….
(1)填空:
①<π>=_____;
②如果<2x-1>=3,则实数x的取值范围为_______;
(2)举例说明<x+y>=<x>+<y>不恒成立;
(3)求满足<x>=
x的所有非负实数x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)填空:
①<π>=_____;
②如果<2x-1>=3,则实数x的取值范围为_______;
(2)举例说明<x+y>=<x>+<y>不恒成立;
(3)求满足<x>=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
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解答题-问答题
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较难
(0.4)
名校
【推荐2】已知:点
、
在数轴上的位置如图所示,
为原点,点
对应的数是90.点
从点
出发,以每秒3个单位的速度沿数轴向点
运动,同时点
从点
出发,以每秒6个单位的速度沿数轴向点
运动(当点
运动到点
时,点
、
均停止运动).设运动的时间为
秒.
(1)若
、
两点相遇,求
的值;;
(2)若
、
两点相距18个单位长度,求
的值;
(3)若在
、
相遇前,线段
之间只有10个整数点(不包括点
、点
),求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/e3ae475e-cb23-4cc1-a930-f26631c547a3.png?resizew=215)
(1)若
![](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/36a1b09c653185842513e24ebba60bb3.png)
(2)若
![](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/36a1b09c653185842513e24ebba60bb3.png)
(3)若在
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.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/36a1b09c653185842513e24ebba60bb3.png)
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