Part 21. Find the coefficient of x3 in the expansion of(x^2-2x+6)(x^3+3x^2-5x+7) .求在 (x^2-2x+6)(x^3+3x^2-5x+7) 的展開式中x3的數。 A.1 B.3 C.-5 D.-2 E. 7 相关知识点: 试题来源: 解析 答案c 解析 (x2-2x+6)(x3+3x2-5x+7) 含x2的项为x2(-5x),(...
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智能科学系教材——数据分析基础定义12变异系数（Coefficient of Variation）定义为：CV s ¯x ×100%.(3.4)变异系数是刻画数据相对分散性的度量。定义13偏度（Skewness）定义为：g1 n (n−1)(n−2)s3 n ∑ i=1 (x i−¯x)3= n2u3 (n−1)(n−2)s3 ,(3.5)其中u k 1n n ∑ ...
Effects of starvation and feeding upon corpus allatum activity and ocyte growth in adult female Periplaneta americana Direct radiochemical determinations of juvenile hormone (JH) biosynthesis by corpora allata (CA) isolated from starved and re-fed Periplanteta americana ha... RJ Weaver,GE Pratt -...
The relationship between CCC and CIA as well as the impact of between-subject variability are presented algebraically and graphically. Several examples are presented to explain the interpretation of the CCC and CIA values. 展开 关键词: agreement coefficient of individual agreement concordance correlation...
We have synthesized, for the first time, a thin silica film doped with condensed J aggregates of 1,1′-diethyl-2,2′-cyanine bromide dye using a simple sol–gel method. The film is homogeneous in thickness and stable at room temperature. The J band formed in the spin coating process is...
5.6.3 Values of the Pearson Correlation Coefficient Than Can Be Considered as Satisfactory A crucial question that arises is which is the value of rXY for which a correlation between the variables X and Y can be considered strong or in any case satisfactory. The answer to this question depends...
摘要: The temperature coefficient of resistance for n- and p-type silicon has been calculated between 50 and 125°C for a wide range of concentrations and levels of compensation. These results provide a useful guide for the design of silicon integrated resistors....
this could indicate the presence of different dimensions in the measure. In order for a measure to be unidimensional, three conditions must be present: (1) the measure must be homogeneous, (2) the measure must be internally consistent, and (3) the measure must be externally consistent. To ...
a.a numerical or constant factor in an algebraic term:the coefficient of the term 3xyz is 3. b.the product of all the factors of a term excluding one or more specified variables:the coefficient of x in 3axyz is 3ayz. 2.(General Physics)physicsa value that relates one physical quantity...