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二次方程的整数解包括含参系数的一元二次方程的整数解和二次不定方程的整数解,它是竞赛中的热点考题.下面介绍几种常用的求解方法. 相似文献
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黄细把 《数理化学习(初中版)》2005,(3):27-28
初中数学学习中,尤其是初中数学竞赛中,求不定分式方程整数解的问题屡见不鲜.本文介绍几种方法,供参考. 一、巧用分离整数 例1 (2004年天津市初中数学竞赛试题)方程x+3/x+1-y=0的整数解有( ) (A)一组 (B)二组 相似文献
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从数学机械化角度给出了求一元二次方程和一元三次方程的整数解的数学模型,并给出了一元二次方程的正整数解的几何解释。 相似文献
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求二元不定方程的整数解是数学中一个古老的课题,它不但可以解决一些实际问题,而且也是近年来数学竞赛中的一个重要内容.本文举例介绍其整数解的常见求法. 相似文献
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证明了丢番图方程s4-4s3 t-6s2 t2 4st3 t4=1仅有整数解 (s ,t) =(± 1,0 ) ,( 0± 1) ,(± 2 ,± 3 )和 (± 3 , 2 ) ;丢番图方程s4-8s3 t 6s2 t2 8st3 t4=1仅有整数解 (s ,t) =(± 1,0 )和 ( 0 ,± 1)。 相似文献
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乐茂华 《周口师范学院学报》2004,21(5):8-8,69
证明了:如果(x ,y, z)是方程xy yx=z2的一组适合 min(x , y )》1,gcd(x , y)=1且x y为奇数的正整数解,则x和y都不是平方数. 相似文献
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乐茂华 《黄冈师范学院学报》2001,(3)
设 a,b,c,k是适合 a +b =ck,gcd(a,b) =1 ,c∈ { 1 ,2 ,4} ,k >1 ,而且 k在 c =1或 2时为奇数的正整数 ;又设ε=(a + - b) /c ,ε=(a - - b) /c .证明了 :当(a,b,c,k)≠ (1 ,7,4,2 )或 (3 ,5 ,4,2 )时 ,至多有 1个大于 1的正奇数 n适合 |(εn -εn) /(ε-ε) |=1 ,而且如此的 n必为满足 n <1 +(2 logπ) /logk +2 5 6 3 .43 (1 +2 1 .96π/logk)的奇素数 相似文献
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In this paper, the minimal residual (MRES) method for solving nonsymmetric equation systems was improved, the recurrence relation was deduced between the approximate solutions of the linear equation system Ax = b, and a more effective method was presented, which can reduce the operational count and the storage. 相似文献
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微分差分KdV方程新的类多孤子解 总被引:3,自引:0,他引:3
This article is concerned with the Hirota direct method for studying novel multisoliton solutions of the discrete KdV equation.First the Hirota method was introduced,then the novel multisoliton solutions were obtained.Simultaneously the figures of the novel one-soliton solution and two-solton solution were given and the singularity of the novel multisoliton solutions was discussed.Finally it was pointed out that the multisoliton solutions with sigularity can be called soliton-like solutions. 相似文献
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对于任意维的NW方程.我们采用扩展的双曲函数级数拟解求得了4 种不等阶精确孤波解和8种行波解,对于相关的低维相关方程的精确孤波解也进行了讨论. 相似文献
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HUANGDe-bin LIUZeng-rong 《上海大学学报(英文版)》2001,5(4):273-275
In this paper,the nonlinear Schrodinger(NLS)equation was analytically solved.Firstly,the stationary solutions of NLS equation were explicitly given by the elliptic functions.Then a family of exact solutions of NLS equation were botained from these stationary solutions by a method for finding new exact solutions from the stationary solutions of integrable evolution equations. 相似文献
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In this paper,the dynamical behavior of coupled map lattics(CMLs) discretised from Nagumo equation was considered,and it was proved that there exist various periodic solutions in the CMLs. 相似文献
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1 Introduction Variousnumericaltechniques,suchasthefinitedifferencemethodandfiniteelementsmethod ,havebeenusedinthepasttosolvetheincompressibleflowproblemnumerically .Usually ,thesemethodsrequirealargenumberofdiscretizedpointsinthecomputa tionaldomainforaccurateresults .Becausetheinfor mationonallgridpointsisusedtofitderivativesatgrid pointsinthedifferential quadrature (DQ )method ,itisenoughtouseonlyfewgridpointstoob tainhigh accuracynumericalsolutions .Therefore ,thenumberofgridpointscanb… 相似文献
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何应辉 《蒙自师范高等专科学校学报》2013,(2)
Kudryashov-Sinelshchikov(K-S)方程具有重要的物理背景和研究意义,很多学者对其精确解进行了研究,在=-3和=-4时得到了各种形式的精确行波解.本文利用指数函数法对该方程的精确行波解进行了研究,获得了该方程在任意参数条件下具有一般形式的精确行波解,包括孤立波解和周期波解,将原有的结果进行了有效的推广. 相似文献