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有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？ 1.程序分析：可填在百位、十位、个位的数字都是1、2、3、4。组成所有的排列后再去 　　　　　　掉不满足条件的排列。 -There are numbers 1,2,3,4, how many can be composed of mutually exclusive and non-duplication of the same three-digit numbers? How many are? 1. Program analysis: can be filled in the 100, 10, single-digit figures are 1,2,3,4. With all components and then remove the conditions are not satisfied with the arrangement.

c51中关键词说明,帮助初学着掌握C ,-C51 in the words that help the beginner to master C,

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连连看在线玩，测试过，可以用的，非常简单，直接下下为就可以了-Lianliankan online play, test, and can be very simple, direct for the next can be a

FAT32文件格式简介。对FAT32文件格式做了一个初步的介绍，使读者能真了解FAT32文件格式的原理。-About FAT32 file format. FAT32 file format made for an initial introduction, so that the reader can genuinely understand the principle of FAT32 file format.

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IEEE文件格式写法，帮助你去改稿，符合IEEE文件标准。给菜鸟看的，大虾可飘过。-IEEE file format written to help you to change draft documents in line with the IEEE standard. To look at the rookie, shrimp may be drifting away.

学习网页设计的好东西，一些讲座PPT和网页制作的方法。-Learning Web Design a good thing, a number of seminars and web pages produced by PPT method.

离散Fourier变换（简称DFT）为离散信号的分析从理论上提供了变换工具，但由于计算时间较长而难以实现，快速Fourier变换（简称FFT）则是一种减少计算时间的有效算法。本文在对DFT计算量进行分析的基础上指出了FFT的实现途径与计算方法，针对FFT算法进行了程序设计并给出了应用实例。-Discrete Fourier transform (referred to as DFT) analysis for discrete signal theory provides a transform tool, but due to a computational time and difficult to realize, fast Fourier transform (the FFT) is a reduction in the effective algorithm to calculate time. In this paper, DFT calculation was carried out on the basis of the analysis points out the ways and realize the FFT calculation of FFT algorithm for program design and application examples are given.