B。对于选项 A,f(x) = x^2 - 2x - 8 = (x - 4)(x + 2),f(x) < 0 的解为 -2 < x < 4,不符合条件。选项 B,f(x) = -x^2 + 2x + 8 = -(x - 4)(x + 2),f(x) < 0 的解为 -2 < x < 4,符合。选项 C,f(x) = x^2 + 2x - 8 = (x + 4)(x - 2),f...
A function whose domain is the s e. o f all positive integers is called an infinite sequenc e. (3)一个复值序列收敛当且仅当它的实部和虚部分别收敛。 A complex-valued sequence converges i f and only.i f both the real part and the imaginary part converge separately.place汉译英(1)数学...
Example Problem 1 - Representing the Derivative of a Function as the Limit of a Difference Quotient If {eq}f(x)=4x^2-1 {/eq}, which of the following limit expressions represents {eq}f'(x){/eq}? A. {eq}\lim\limits_{h\ \to\ 0}\ \dfrac{(4(x+h)^2-1...
looking at how state public schools across the country address climate change in science classes, gave barely half of US states a grade B+ or higher. Among the 10 worst performers were some of the most populous states, including Texas, which was given the lowest grade...
D) minimumrequiredutilityoftheportfolio.Answer:BDifficulty:Moderater. 相关知识点: 试题来源: 解析 B 效用函数常用形式为U = E(R) - 0.5*A*σ²,其中A代表风险厌恶系数。选项B正确,因A衡量投资者对风险的厌恶程度。选项A(收益要求)是E(R)而非A;选项C(确定性等价率)由公式推导得出,但并非A代表的...
Find a vector function that represents the curve of inter-section of the two surfaces.The cylinder x^2+y^2=4 and the surface z=xy 相关知识点: 试题来源: 解析 The projection of the curve C of intersection onto the xy-plane is the circle x^2+y^2=4, z=0.Then we can write x=2...
Regarding marketed medicinal products: a response to a drug which is noxious and unintended and which occurs at doses normally used in man for prophylaxis, diagnosis, or therapy of diseases or for modification of physiological function (see the ICH Guideline for Clinical Safety Data Management: De...
with the demise of Enron stock. But making sure it never happens again may not be possible, because the sudden impoverishment of those Enron workers represents something even larger than it seems. It’s the latest turn in the unwinding of one of the most audacious promise of the 20th ...
The concept presented in this review article represents a paradigm change in the way society is associated with nature, and is aimed at preventing the depletion of resources. Sustainable development can be introduced on a micro- (enterprises and consumers), meso- (economic entities integrated in ...
A A university motto(校训) represents the values and culture of that institution. Read the following motto. Match them first with the universities, and then with the English translations.Motto1. 自强不息,厚德载物2. 饮水思源,爱国宜校3. 学为人师,行为世范4. 博学而写志,切问而近思5. 诚朴图伟...