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探索型题目虽然在课本中很少见，却是近年来中考的热门题，并常在压轴题中出现．本以1998年的中考题为例介绍结论探索题的类型和解答思路，以帮助初三同学温课迎考． 相似文献
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提出一种基于模糊模拟的R&D项目多准则选择方法,将企业的R&D项目选择决策过程分为战略和战术两个阶段,分别采用模糊优选模型和模糊多准则评价模型对项目进行选择,以确定符合企业发展战略的最优R&D项目. 相似文献
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In this paper,the control of complex delayed networks with different nodes is proposed.Firstly,the stabilization of coupled networks with time delay is investigated.By constructing a Lyapunov function,a linear feedback controller design procedure for the networks is converted to the problem of solving a set of linear matrix inequalities.Then the results are extended to networks with both delayed dynamical nodes and delayed couplings.It is shown that the stabilization of complex networks is determined by the dynamics of each uncoupled node,coupling matrix and feedback gain matrix of networks.Two examples are simulated.In the first example,a network with 10 nodes consisting of Lorenz systems and systems proposed by Zhang in 2009 is given.It is found that the network states are divergent without control,and convergent under designed linear feedback controllers.In the second example,a larger network with 100 nodes consisting of delayed Chen systems and delayed Lorenz systems is given.The proposed method is also effective for large scale networks. 相似文献
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我们知道．平行线有如下性质：1．两直线平行，同位角相等；2．两直线平行，内错角相等；3．两直线平行，同旁内角互补．因此，利用平行线的性质，可以：1．证明两个角相等；2．求角的度数；3．把一个角大小不变地迁移到我们所需要的图形中．这就是平行线的基本功能与作用．例1已知：如图1，E是DF上的点，B是AC上的点，∠1＝∠2，∠C＝∠D．求证：∠A＝∠F．分析由图形知，∠A与∠F是内错角．因此，要证∠A＝∠F，只须证DF∥AC．这只要根据已知证出∠D＝∠ABD即可．证明∠1＝∠2（已知），∠1＝∠3（对顶角相等），∠2＝∠3．BD∥… 相似文献
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In the economic order quantity （EOQ） model, the decision maker has vague information about holding cost, ordering cost and market demand. With these uncertainties characterized as fuzzy variables, a new formula is developed by analyzing the fuzzy total cost. By comparing with other four EOQ formulas, i.e., using the crisp numbers with the highest membership values in classic EOQ formula, using the expected values of fuzzy parameters in classic EOQ formula, using the fuzzy variables in classic EOQ formula and then calculating the expected value, and calculat- ing EOQ by hybrid intelligent algorithm simulation, the effectiveness of this formula Js illustrated. 相似文献
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In order to solve three kinds of fuzzy programm model, fuzzy chance-constrained programming mode ng models, i.e. fuzzy expected value and fuzzy dependent-chance programming model, a simultaneous perturbation stochastic approximation algorithm is proposed by integrating neural network with fuzzy simulation. At first, fuzzy simulation is used to generate a set of input-output data. Then a neural network is trained according to the set. Finally, the trained neural network is embedded in simultaneous perturbation stochastic approximation algorithm. Simultaneous perturbation stochastic approximation algorithm is used to search the optimal solution. Two numerical examples are presented to illustrate the effectiveness of the proposed algorithm. 相似文献
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列方程（组）解应用题是历年中考不可或缺的热门题型．许多同学对如何列方程（组）茫然不知所措，对一道应用题给出多种解法更是倍感头疼．事实上，解应用题时，只要把题目中用日常语言表述的各种关系．“翻译”成代数语言就够了．每一道题的各种数量关系，如果从不同的角度、不同的侧面去分析，就能得出不同的解法．请看下例：例有120名学生，要到离校100公里的某地去参观，学校只有一部能载60人的客车，于是，决定把学生分为两批，第一批60人先乘车，第二批60人先步行，两批同时出发，把第一批学生送到适当的地点后，第一批学生下车步行，… 相似文献
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The buyer-supplier relationship plays a great role in most economic systems.The buying firm usually tries to find a new supplier who provides products with satisfying quality and lower price.A broad br... 相似文献
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随着市场经济格局的逐渐形成，一个以人才竞争的知识经济时代已经到来。人才是第一资源，人才是第一资本，这一根本理念以达成全社会的共识。怎样培养、吸引使用好人才已经突出地摆在各级党委和政府面前。“人才兴业”已被确定从上至下经济发展的重要战略之一。 相似文献