共查询到18条相似文献,搜索用时 62 毫秒
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这是一个非常经典的概率题目.将长为1的木棒随机折成3段,求这三段构成三角形的概率.常见解法是:设三段长度为x,y,1-x-y,其中0<x<1,0<y<1,而要构成三角形,必须满足x+y>1-x-y,x+1-x-y>y,y+1-x-y>x,所以满足条件的点是如图1所示的阴影区域,P(A)=1/4. 相似文献
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通过引入随机变量的思想推广全概率公式,由此可得到解决几何概型的一种方法,实例说明这种方法在求解几何概型方面的的应用。 相似文献
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本文推广了文[2]中的结果,对于任意三角形单元的三次Lagrange型插值多项式给出了原函数u与被插函数U之间的误差估计 相似文献
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文[1],[2]分别研究了三角形的三条中线,三条角平分线构成的三角形的性质,受到两文的启发,笔者对三角形三条高组成的三角形进行了探究,得到如下的几个性质. 相似文献
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经过研究,从平面向量的基本定理、三角形重心的向量等式、特殊法、坐标法等不同的角度思考此题,有以下几种精彩解法. 相似文献
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Andrzej Zak 《Discrete and Computational Geometry》2005,34(2):295-312
We prove that the number of non-similar triangles T which can be dissected into two,
three or five similar non-right triangles is equal to zero, one and nine, respectively. We find all
these triangles. Moreover, every triangle can be dissected into n similar
triangles whenever n = 4 or n ≥ 6. In the last section we allow dissections
into right-triangles but we add another restriction. We prove that in any perfect,
prime and simplicial dissection into at least three tiles, the tiles must have one
of only three possible shapes. 相似文献
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分堆问题是排列组合中常遇到的难题之一.通过一个易错概率题的分析,推广了分堆问题,定义相同结构,并对相同结构下的排列组合进行研究,给出了相同结构下的计算公式,并利用离散型随机变量的性质加以验证.此外,还发现了一个符号运算的恒等式,并进行了证明. 相似文献
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Doklady Mathematics - Abstract—We give a solution to the Kolmogorov problem on uniqueness of probability solutions to a parabolic Fokker–Planck–Kolmogorov equation. 相似文献
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The Physics of Self-Adjoint Extensions: One-Dimensional Scattering Problem for the Coulomb Potential
We consider a one-dimensional single-center scattering problem on the entire axis with the original potential |x|–1. This problem reduces to seeking admissible self-adjoint extensions. Using conservation laws at the singularity point as necessary conditions and taking the analytic structure of fundamental solutions into account allows obtaining exact expressions for the wave functions (i.e., for the boundary conditions), scattering coefficients, singular corrections to the potential, and also the corresponding spectrum of bound states. It then turns out that pointlike -corrections to the potential must necessarily be involved for any choice of the admissible self-adjoint extension. The form of these corrections corresponds to the form of the renormalization terms obtained in quantum electrodynamics. The proposed method therefore indicates a 1:1 relation between boundary conditions, scattering coefficients, and -like additions to the potential and demonstrates the general possibilities arising in the analysis of self-adjoint extensions of the corresponding Hamilton operator. In the part pertaining to the renormalization theory, it can be considered a generalization of the renormalization method of Bogoliubov, Parasyuk, and Hepp. 相似文献