1 . 我们规定:
表示不大于
的最大整数,如
,
,根据这个规定,若
,则
的取值范围是____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876b42408dbe9c712b2c3b6264d7f9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0401b9187f94db7cacbea005d065b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93b8f1a230550ce3181d2dd0545dba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2 . 算筹是在珠算发明以前我国独创并且有效的计算工具,为我国古代数学的发展做出了很大的贡献,在算筹计数法中,以“纵式”和“横式”两种方式来表示数字如图:
表示多位数时,个位用纵式,十位用横式,百位用纵式,千位用横式,以此类推,遇零则置空,如“![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/399d9dbe21b64f5b8c01b91486e750d3.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/ff035cc5c80d49e1a7a0cbf51cec6baa.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/867dbc205c15481a9a0adcc9bc05eb70.png?resizew=22)
”表示的数是
,“![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/399d9dbe21b64f5b8c01b91486e750d3.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/ff035cc5c80d49e1a7a0cbf51cec6baa.png?resizew=21)
”表示的数是
,若已知一个用这种方式表示的四位数中含有“
”、“
”和两个空位,则这个四位数是______ .
数字 形式 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
纵式 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
横式 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/399d9dbe21b64f5b8c01b91486e750d3.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/ff035cc5c80d49e1a7a0cbf51cec6baa.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/867dbc205c15481a9a0adcc9bc05eb70.png?resizew=22)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/dc4459cbcb164f80a08f60e5ec81822e.png?resizew=29)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d76c63aae9b262eb0f8b2d046052c6.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/399d9dbe21b64f5b8c01b91486e750d3.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/ff035cc5c80d49e1a7a0cbf51cec6baa.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/dc4459cbcb164f80a08f60e5ec81822e.png?resizew=29)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a56ce8669e968b710de96860366514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae65a0dcb0a921dc40b35e22dd0dd0b4.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601683279872/3064778992771072/STEM/3336f4e8f62e49b086bc8e794b1c90a0.png?resizew=22)
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2022-09-12更新
|
104次组卷
|
7卷引用:湖北省武汉市江汉区2021-2022学年七年级上学期期中数学试题
3 . 若一个四位自然数满足个位数字与百位数字相同,十位数字与千位数字相同,我们称这个四位自然数为“双子数”.“双子数”
的百位、千位上的数字交换位置,个位、十位上的数字也交换位置,得到一个新的双子数
,记
为“双子数”
的“双11数”.
例,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1954443f15e1bec56308b6172caab916.png)
(1)计算3636的“双11数”
.(写出计算过程)
(2)已知两个“双子数”
、
,其中
,
(其中
,
,
,
且
,
,
,
都为整数),若
的“双11数”
能被17整除,且p、q的“双11数”满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7093538ecfb10a639b23863e7331a66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b477bd2696c098ef3d6038ff421bb4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
例,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e60d8706447cc64a1371189962f8c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471972d2f12a31eaf627e528ca4389e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1954443f15e1bec56308b6172caab916.png)
(1)计算3636的“双11数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08e64644cbeed6ce7e0e5c61e66d417.png)
(2)已知两个“双子数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a06de11058b0a3550e2782bdd282b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836dff80afb95b1eb8f84dbf93fd66ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b7e47c3e4f8ebccf01b6e9df866430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef44496baeec23250f8bd229bae41de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669b9a32dbbf8810c5e9e69f28bac4d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c75009fdbf21e39e0a0a34fe52080fe.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57a8a584b9571c6c528786a217c4aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9711eed04af0df8610ffa1e6cf56188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0fe0596dfe9cf171ef9040c7a5ff5b8.png)
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2022-09-11更新
|
128次组卷
|
2卷引用:重庆市荣昌初级中学2020-2021学年七年级下学期期中数学试题
4 . 规定一种定义新运算:
(a是有理数),例如:
,则当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d628467922c70700c9ec050a16e9482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11e1b28b571038a74d411b07c11488e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9425814e290fff22482e3f9c19707369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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5 . 阅读理解:定义:如果一个数的平方等于﹣1,记为
=﹣1,这个数i叫做虚数单位,把形如a+bi(a,b为实数)的数叫做复数,其中a叫这个复数的实部,b叫做这个复数的虚部,它的加,减,乘法运算与整式的加,减,乘法运算类似.
例如计算:(2﹣i)+(5+3i)=(2+5)+(﹣1+3)i=7+2i;
(1+i)×(2﹣i)=1×2﹣i+2×i﹣
=2+(﹣1+2)i+1=3+i;
根据以上信息,完成下列问题:
(1)填空:
=_____;
=_____;
= ;
=____.
(2)计算:①
;
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9876a97a68caadd6b177ee250eb229.png)
(3)在复数范围内分解因式:①
_____;
②
_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819a0b98a210476474e12aa1692b55f9.png)
例如计算:(2﹣i)+(5+3i)=(2+5)+(﹣1+3)i=7+2i;
(1+i)×(2﹣i)=1×2﹣i+2×i﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819a0b98a210476474e12aa1692b55f9.png)
根据以上信息,完成下列问题:
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed9cceee603afe981542717871ad3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80fd9ae5c9fd472f9207ce2c08837c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7aaadc9383e7ccb25286bd557e4da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae9e204b1b6e8184b0e0b69cb308ad4.png)
(2)计算:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb21eea1e132cb1f278fd095060b88d.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9876a97a68caadd6b177ee250eb229.png)
(3)在复数范围内分解因式:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e33a8d47b0084eefdf0ea785dbf407.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103cd19f1ad00c5f4999e60b6a3e56a1.png)
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6 . 在平面直角坐标系xOy中,对于任意三点A,B,C的“矩面积”给出如下定义:“水平底”a:任意两点横坐标差的最大值,“铅垂高”h:任意两点纵坐标差的最大值,则“矩面积”S=ah.
例如:三点的坐标分别为A(1,2),B(-3,1),C(2,-2),则“水平底”a=5,“铅垂高”h=4,“矩面积”S=ah=20.
(1)已知A(-1,4),B(3,1),C(-3,-3),则“水平底”a= ,“铅垂高”h= ,“矩面积”S= ;
(2)若A(1,2),B(-3,1),P(0,t)的“矩面积”为12,求点P的坐标;
(3)若A(1,2),B(-3,1),P(0,-t),请直接写出A,B,P三点的“矩面积”的最小值.
例如:三点的坐标分别为A(1,2),B(-3,1),C(2,-2),则“水平底”a=5,“铅垂高”h=4,“矩面积”S=ah=20.
(1)已知A(-1,4),B(3,1),C(-3,-3),则“水平底”a= ,“铅垂高”h= ,“矩面积”S= ;
(2)若A(1,2),B(-3,1),P(0,t)的“矩面积”为12,求点P的坐标;
(3)若A(1,2),B(-3,1),P(0,-t),请直接写出A,B,P三点的“矩面积”的最小值.
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7 . 若符号[a,b]表示a,b两数中较大的一个数,符号(a,b)表示a,b两数中较小的一个数,则计算
的结果是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af6ce6f9a0a4409525826c66e1e9f8d.png)
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8 . 定义新运算“*”如下:
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c3338625869ad8c532283001d4c7ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa79b194a738f884b3d44d1ac3ee48b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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2022-09-03更新
|
232次组卷
|
3卷引用:江苏省苏州市相城区阳澄湖中学2021-2022学年九年级上学期阳光测评2数学试题
9 . 若规定一种运算:a*b=a﹣b+ab,则3*(﹣2)=_____ .
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10 . 若新运算“※”定义为:a※b=
,则1※
=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734cfc91085b7f146fb87f3ee701d299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e9c05044374e751ea377db4f1362d1.png)
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2022-09-02更新
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85次组卷
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3卷引用:湖南省安仁县思源实验学校2021-2022学年七年级上学期期中考试数学试题