1.Does formula f(x)=1/(x²-2) define a function f:R->R?A

我考2022-10-04 11:39:542条回答

1.Does formula f(x)=1/(x²-2) define a function f:R->R?A function Z->R?
2.If there are 2187 function f:A->B and |B|=3.What is |A|?
3.Give an example of a function f:A->B and A1,A2 in the A for which f(A1∩A2) ≠ f(A1)∩f(A2)
4.If A={1,2,3,4,5} and there are 6720 injective functions f:A->B,what is |B|?

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不会游泳的蛤蟆 共回答了14个问题 | 采纳率100%
都很简单呀.
1.
f不是R->R上的函数,因为x=sqrt(2)时,分母等于0.(sqrt代表开根号)
但f是Z->R上的函数,因为x取任意整数都不会导致分母为0.
2.
根据排列组合中的乘法原理,A->B的函数,共有|B|的|A|次方个.
也就是说3的|A|次方=2187,所以|A|=7
3.
f(1)=f(2)=1,f(3)=3
A1={1,3},A2={2,3},则:{3} = f(A1∩A2) ≠ f(A1)∩f(A2) = {1,3}
4.
单射函数,所以根据排列组合中的原理,应该有:P(|B|,|A|)个.
其中P(|B|,|A|)表示|B|个中取|A|个的排列数.
放到这题里,|A|=5,所以|B|=8
1年前
sea19801130 共回答了1个问题 | 采纳率
我不会
1年前

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K.K.[6f%rmj*l*]
n.(名词)
【复数】 for.mu.las 或 for.mu.lae [-l¶”]
An established form of words or symbols for use in a ceremony or procedure.
惯用法:用于典礼、仪式或礼节的惯用语或标志
An utterance of conventional notions or beliefs; a hackneyed expression.
客套话:常用信条的陈述或信仰的自白;陈腐的语句
A method of doing or treating something that relies on an established, uncontroversial model or approach:
准则,方案:依据惯用的、无争议的模式或方法而采取的对某些事情的做法或处理方式:
a new situation comedy that simply uses an old formula.
只沿用旧方案的新系列幽默剧
Chemistry
【化学】
A symbolic representation of the composition or of the composition and structure of a compound.
分子式:表示化学物质成分或组成方式的符号表达式
The compound so represented.
分子:分子式所表示的化合物
A prescription of ingredients in fixed proportion; a recipe.
配方,处方:按一定比例将各种成分配制成药剂的方法;处方
A liquid food for infants, containing most of the nutrients in human milk.
婴儿食品:用来哺育婴儿的液体食物,含有人奶中的大部分营养物
Mathematics A statement, especially an equation, of a fact, rule, principle, or other logical relation.
【数学】 公式,程式:表示普遍事实、规律、法则或其它逻辑联系的陈述,尤为一等式
Formula Sports A set of specifications, including engine displacement, fuel capacity, and weight, that determine a class of racing car.
Formula 【体育运动】 训练课程:一套规程,包括发排机排量、燃料容量和重量,决定着赛车的级别
invent
[in5vent]
vt.
发明, 创造
v.
发明
invent
in.vent
AHD:[¹n-vµnt“]
D.J.[!n6vent]
K.K.[!n6vWnt]
v.tr.(及物动词)
in.vent.ed,in.vent.ing,in.vents
To produce or contrive (something previously unknown) by the use of ingenuity or imagination.
发明:运用智谋或想象生产或设计(以前未知的东西)
To make up; fabricate:
捏造;虚构:
invent a likely excuse.
编造似真的借口
acid test ratio ,gearing ratio 的意思?formula?
8wy7342481年前1
前世金生_首饰 共回答了14个问题 | 采纳率92.9%
BB
The function f is given by the formula
The function f is given by the formula
f(x)=(6^3+31x^2+14x+45)/(x+5)
when x
klyz_00131年前3
一鸣惊人123 共回答了23个问题 | 采纳率91.3%
你是数理学院的吧?把-5带进去就好了
Write a formula for the third degree polynomial whose graph
Write a formula for the third degree polynomial whose graph is given below
这道题是叫我把这个图像的函数表达式写出来吗?formula不是公式的意思吗?难道叫我写公式?
vaiscopyca1年前1
阿道夫nn复活 共回答了15个问题 | 采纳率93.3%
是写函数表达式
formula 30 乙醇规格:Formula 30
2973842731年前1
heroicl 共回答了12个问题 | 采纳率83.3%
纯度或者说浓度30%
英文的use the quadratic formula to find the zeros of the functi
英文的
use the quadratic formula to find the zeros of the function.
f(x)=25x^2+80x+64
Express your anwser in simplified form,do not convert to decimal form.
changable1年前1
或域 共回答了21个问题 | 采纳率95.2%
(楼上胡说)
用二次公式求下列函数的零点(即求根)
简化答案,但不要写成小数形式.
x= (- 80 ± √(80²-4*25*64))/(25*2)
= -8/5
英语翻译1.what is the formula for momentum,and is it a vector?2.
英语翻译
1.what is the formula for momentum,and is it a vector?
2.Briefly state Newton's Third Law.
3.If a box is sliding to the right,direction is the force of friction on the box?
4.Name one difference between mass and weight.
宝贝苯笨1年前6
adamking2002 共回答了20个问题 | 采纳率90%
1.动量公式是什么,它是矢量吗?
动量:p=mv {p:动量(kg/s),m:质量(kg),v:速度(m/s),方向与速度方向相同} ,是矢量.
Momentum:p = mv (p:momentum (kg / s),m:mass (kg),v:velocity (m / s),direction and speed in the same direction) is a vector.
2.简述牛顿第三定律.
牛顿第三定律:两个物体间的作用力和反作用力总是大小相等,方向相反,并且作用在同一直线上 .F1=-F2
①力的作用是相互的.同时出现,同时消失.
②相互作用力一定是相同性质的力
③作用力和反作用力作用在两个物体上,产生的作用不能相互抵消.
④作用力也可以叫做反作用力,只是选择的参照物不同
⑤作用力和反作用力因为作用点不在同一个物体上,所以不能求合力
Newton's Third Law:the force between two objects and reaction are always equal and opposite,and the role of a straight line.F1 =- F2
① force's role is mutual.Also appear at the same time disappear.
② interaction force must be of the same nature
③ reaction force and the role of the two objects,the resulting effect can not cancel each other out.
④ called the reaction force can only choose different reference
⑤ force and reaction force acting point is not the same as an object,it can not seek together
3 如果一个箱子向右侧滑动,求摩擦力的方向?

Left
4 陈述一下质量和重量的一点区别
1.定义不同.质量是物体惯性的量度,它是任何物体都固有的一种属性.重量则反映了物体所受重力的大小,它是受地球的吸引而引起的.
2.质量是标量.重量是矢量.
1.Different definition.Quality is the measure of inertia an object,any object which is an inherent property of all.Suffered weight reflects the gravity of the size of the object,it is attracted by the Earth caused.
2.Quality is the scalar.Weight vector.
一个石油价格的翻译The price per barrrel as per the following formula:
一个石油价格的翻译
The price per barrrel as per the following formula:
Average of mean quotations for [(FOB Crude oil (in port A + FOB Crude oil (in port B)/2] published by “Platt’s Crude Oil MARKETWIRE” including three parameters after date of Bill of Lading (only three parameters) by a deduction of USD 0.4 discount per barrel to the Buyer from the pice in US$ and US$ 5,00 per barrel of the Gross Discount.
by a deduction of USD 04.00 discount per barrel
小tama二等兵1年前2
晶彩 共回答了24个问题 | 采纳率83.3%
该价格每桶根据以下公式计算:
“普氏原油MARKETWIRE”公布的平均报价为[(离岸原油(在端口A+离岸原油(在端口B)/2]包括三个参数日期后比尔提单(只有三个参数)买家中扣除0.4美元每桶贴水04.00美元,每桶贴水扣减费用,再加美元及$5,00美元每桶总值的折扣。...
求几道英文化学题的解答1.Draw all the structural formulae of C5H7Cl2.Exp
求几道英文化学题的解答
1.Draw all the structural formulae of C5H7Cl
2.Explain,with the aid of a simple example,what is meant by the term structural isomer.
3.State whether CH3CH2Cl is soluble in water or not,and explain why.
回答也要用英文,
dehaudoo1年前1
米反 共回答了13个问题 | 采纳率100%
我可以先给出中文的答案要点,您再翻译成英文
1这题中的有机物不饱和度为2,可以是两个双键并且在单键的位置加cl,也可以是两个环状结构添加一个cl,还可以是一个环状结构,一个双键添加cl,图按以上去画就可以.
2结构异构体有空间的异构体,平面的异构体两种,它们的结构在空间上有差异,所以叫做结构异构体.
3CH3CH2CL是烃的衍生物,cl作为疏水基在整个物质中占主导地位,所以这个物质不具有亲水性,不溶于水.
英语翻译 The number of cations and anions per formula need
英语翻译
The number of cations and anions per formula need not be included in the compound name because anions have characteristic charges,and the charge of the cation has already been established by its name.There are as many cations and anions as needed to get a neutral compound with the lowest possible integral subscripts.


Name the following compounds by the IUPAC system
(1)(CH3)2CH-CH2-CHOH-(CH3)2
(2)CH2(OH)-CH (OH)- CH2(OH)
(3)CH2=CH-CH=CH-CH= CH2
(4)CH3- CH2-O-CH2-CH2-CH3
(5)CH3-CH2-COONH2(CH3)2
(6)CH3- CH2-COCl
(7)CH2OH-CHOH -CH2-N(CH3)2
(8)CH3- CHBr-CHBr-CH2-CH2-COOH
(9)

(10) CH3- CHBr-CHBr-CH2-CH2-COOH
半边天空1年前1
fisher188 共回答了18个问题 | 采纳率94.4%
阳离子和每个配方的阴离子的数目不需要被包括在该化合物的名称中,因为有阴离子特性的改变,以及阳离子的电荷已经确立了它的名字.有需要获得尽可能低的积分标一个中性化合物尽可能多的阳离子和阴离子.
由IUPAC系统命名下列化合物
taylors formula是什么意思
玉楼冬1年前1
面熟 共回答了25个问题 | 采纳率96%
taylors formula 意思
泰勒公式
如果您有什么疑问和不解之处,欢迎追问我!
如果您认可我的答案,请采纳.
您的采纳,是我答题的动力,O(∩_∩)O谢谢
英语翻译complete the square in the formula for
难得糊涂121年前1
快门碎了 共回答了26个问题 | 采纳率96.2%
在F(x)的完全平方公式里
The following formulae have been used in the derivations sho
The following formulae have been used in the derivations shown below 脑子乱成一团了,该怎么翻译呢
qwerasd121年前3
bwx73444 共回答了19个问题 | 采纳率94.7%
下面的公式已被用于如下所示的推导
如果满意,请记得 点击本页面中的“选为满意回答”按钮,(*^__^*) 谢谢
英语翻译the formula for converting temperature recorded in 度F(不知
英语翻译
the formula for converting temperature recorded in 度F(不知道怎么打度F这个温度符号)to temperature in ℃ is C=5/9(F-32).Convert each of the following temperatures to ℃,to nearest degree:
80度F 32度F 212度F 102度F
轩03041年前2
简爱58 共回答了27个问题 | 采纳率92.6%
华氏度与摄氏度温度之间的转化公式为C=5/9(F-32).把下面的华氏度转化为最精确的摄氏度温度.
80度F 32度F 212度F 102度F
1、5/9(80-32)≈26.67℃
2、5/9(32-32)=0℃
3、5/9(212-32)=100℃
4、5/9(102-32)≈38.89℃
英语翻译the average speed of a car is given by the formula S=D/T
英语翻译
the average speed of a car is given by the formula S=D/T,where D is the distance covered in kilometers and T is the time taken in hours,Find:
1.the speed,if 800 km is covered in 10 hours.
2.the speed of a car which takes 4.5 hours to travel a distance of 250km,
3.the distance travelled,if a car maintains a speed of 65km/h for 5 hours.
4.the time taken,if a distance of 120km is covered at a speed of 80km/h.
jaijiarun1年前1
alicelive 共回答了18个问题 | 采纳率94.4%
麦芽糖D1va ,
一辆汽车的平均速度通过公式s=d/t给出.D代表汽车在T(小时)内行驶的距离里程(千米).求:
1,如果10小时行驶了800千米,速度是多少,
英语翻译Express the statement as a formula that involves the var
英语翻译
Express the statement as a formula that involves the variables w,z,u and a constant of proportionality k,and then determine the value of k from the condition :w varies directly as z and inversely as the square root of u,if z = 6 and u = 4,then w = 24
Please enter your answer as the value of k.
junzord20051年前2
不过如此嘛 共回答了24个问题 | 采纳率83.3%
用公式表达此说明包含的变量W,Z,U和一个恒定比值K,然后根据条件确定K值,条件为:W与Z成正比,与U的平方根成反比,如果Z=6,U=4,那么W=24.
请求出K值.
只能翻.
求助英文单词的简写,比如“式”,formula的简写?
839091年前1
默默嬷嬷 共回答了19个问题 | 采纳率78.9%
Formula 1的简写是F1 当作为数学方程式时,直接把方程式写出来就好了呀
一般比较有名的机构或组织的简写都常常取首字母的 比如说雅思考试IELTS :The nternational English Language Testing System
也有因为重复而取第二个字母的
希望对你有帮助哦~
英语翻译1、产品名称翻译 Twinlab,DualTabs,Mega Vitamin & Mineral Formula
英语翻译
1、产品名称翻译 Twinlab,DualTabs,Mega Vitamin & Mineral Formula
2、Each tablet is composed of one layer of fat soluble vitamins as well as sustained release water soluble vitamins,and another layer of rapid release minerals and digestive aids.
3、The water soluble vitamins are released over a prolonged period of time through the passage in the gastrointestinal tract (digestive tract) for optimum absorption.
4、Added to acidify the stomach and enhance mineral digestion and absorption.
阳光明媚就出游1年前1
俏女孩 共回答了7个问题 | 采纳率100%
Twinlab DualTabs,超级维生素和矿物质配方2,每个平板电脑由一层脂溶性维生素以及持续释放水溶性维生素,和一层快速释放矿物质和消化艾滋病.3、水溶性维生素是长期发布的时间通过胃肠道的通道(消化道)最佳吸收.4、添加到酸化胃,提高矿产消化和吸收.