cn2排列组合公式（排列组合公式）

一年级心算速算技巧？

心算速算——简称快心算，也叫“口算”，数学教学方法之一。一种只凭思维及语言活动不借任何工具的计算方法。它能培养学生迅速的计算技巧，提高学生的注意、记忆和思维能力。

心算速算技巧

凑十法

凑十法”是进位加法的基本思路。运用“凑十法”能够把进位加法转化成整10加几的问题，从而达到化难为简的目的。

口诀

一九一九好朋友，二八二八手拉手，三七三七真亲密，四六四六一起走。五五凑成一双手。看大数，分小数，凑成十，加剩数。大数记心里，小数记手里。

一加九，十只小蝌蚪，二加八，十只花老鸭，三加七，十只老母鸡，四加六，十只金丝猴，五加五，十只大老虎。看到9想到1，看到8想到2，看到7想到3，看到6想到4。看到大数加小数，先把两数换位置。

含义

把一个加数分解成两个数，使得其中分解的一部分和另一个加数相加得到10，再用10加另外一部分数的方法，这就是凑十法。其基本原理是先使两个数的和凑成10，再化成10加几的计算方法。

技巧

比如：9+2=（ ），根据“凑十法”：“9”和“1”是凑成“10”的，即9+1=10，后面的“2”分出“1”后就只剩下“1”了，所以：10+1=11。其他以此类推，如：

破十法

破十法要指当个位不够减时，就用10减去减数，剩下的数和个位上的数相加。

口诀

减九加一，减八加二，减七加三，减六加四，减五加五，减四加六，减三加七，减二加八，破大数，加小数。

技巧

比如：11-4，1-4个位数不够减，所以就从11（10+1）里，用10减去4，就等于6了，再用剩下的数字6和十位数上的1相加，等于7。

其他例子计算过程如下图所示：

进位加法

方法一：“凑十法”（强调：看大数，分小数，凑成十，加剩数）。比如：8+5=8+2+3=13

方法二：“五五凑十”（当两个加数都大于且接近5时适用）。比如：6+7=5+5+1+2=13

方法三：“多加减补”，比如：8+5=10+5-2=13。

退位减法

就是当两个数相减，被减数的个位不够减时，往前一位借位，相当于给这位数加上10，再进行计算。

口诀

几减九退十加一、几减八退十加二、几减七退十加三、几减六退十加四、几减五退十加五、几减四退十加六、几减三退十加七、几减二退十加八、几减一退十加九。

做减法想加法

利用减法是加法的逆运算关系，用加法来思考。这个方法是在之前学习的进位加法基础上进行的。例如，想（）＋9＝27？（18）＋9＝27，所以27－9=18。这个方法运用好的前提就是进位加法必须得掌握好。

例如：11-9=（？），要想9+（？）=11，这样就知道得多少了。

连减法

连减法是一个数连续减两个数，可以等于这个数减两个数的和,得数不变。

口算方法比较多，如何找出适合自己的最佳方法是提高口算速度及正确率的关键。练习时可以和学生一起复习多种口算方法，让学生通过比较，得出最佳的方法。提高计算能力，光掌握技巧是不够的，还需要通过不断做题练习巩固，正所谓“熟能生巧”，这就需要老师或家长每日为宝贝出练习题来巩固技能，特别注意的是：不要让孩子数指头，改掉不良习惯，逐步培养心算能力。

心算的训练

第一步：会动作上简单的计算从加减一开始用动作计算。

拿一个，家长说1加1，孩子由一个再加上一个，孩子快速报2，然后计算2+1=3，一直算到二十。算到二十再一个一个的减回来。注意，一定要算式和动作动应。

分析：从动作到物品到数概念的理解，是一个量变到质变的过程，家长一定要细心！

第二步：用简单的计算题练习速度从纸上随意位置从一写到十，让孩子看数后快速加上一或减去一。

这样把十或二十以内的加减一练习相当熟练了（一秒一题），孩子就养成了一个快速计算的习惯。以后再学习其它计算，孩子也想尽快答出来。起初，孩子计算会常常算错，但孩子在一秒钟以内就能感觉算错了。

分析：计算其实就是1+1，这个搞懂了，其他就不用怕了。

第三步：循续渐进的练习其它计算

这里重要提示：计算题就只写一张纸二十题就行，单页训练，不要怕重复。

工具书推荐

《神奇的逻辑思维游戏书》

这本书以彩色图片的形式展示，更直观，解析同样是图解，尤其是排列顺序的问题。这本书所选的题目来自“世界趣味数学”，旨在培养孩子从多角度看问题的能力，对孩子的吸引力更大些。

《10倍速心算》

这本书很适合家长引导孩子学习心算方法，例题和各种解法，无论是通过文字讲解或是习题慢动作回放，都是思路展示，家长都可以引导拓展孩子的解题思维，这样也能帮助孩子逐步摆脱老师是否说过或教过，才可以接受新方法，这才能进入主动学习的状态。

心算的好处

（1）心算速算可以有效的开发大脑的潜能。

教学法通过手的灵活性和大脑对手控制精度的训练，模拟电脑运算原理从而形成最简捷的计算方式。

（2）心算速算一旦掌握终生受益。

脑算是最实用的技术。全脑速算的教学过程不需要任何教具就能进行。不受空间地点的限制。

（3）心算速算教学效果奇特。

4-12岁的孩子通过45次课的系统学习就能快速脑算任意数加、减、乘、除、乘方及验算。其速度可超过计算器。

（4）心算速算通过手的活动刺激大脑，最终让孩子用脑算代替手算。

遵循全脑开发循序渐进的原理。

（5）数学是所有科学的工具和基础。

心算速算的运算原理以有韵律的文字口诀表现出来，促进学科间的相互渗透，全面提高孩子的综合能力。

（6）心算速算的训练过程就是大脑记忆能力和快速反应能力的开发。

脑算能力好的人自然是大脑的记忆容量大和反应速度快。

（7）心算速算使左右手的快速伸屈刺激了左右脑细胞的兴奋。

使左右脑平衡发展，同时活跃起来参与记忆和思维。促进智能开发。

（8）心算速算提高孩子的操作技能。

技能的训练，都是手脑协调的训练，即大脑对手的控制指挥能力的训练，训练手脑配合的协调，使手变的灵巧自如，从而促进孩子的潜能开发。

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排列中2的n次方等于什么？

Cn0+Cn1+Cn2+.....+Cnn=2^n

如果把一个数列倒过来他的逆序数会变吗？

如果数列各项都不想等，那么倒置顺序以后，设原数列一共有n项，那么新数列的逆序数是Cn2–k=n(n–1)/2–k。

设一组数列的逆序数是k如果把这组数列倒过来那么新数列的逆序数是多少？

解：如果数列各项都不想等，那么倒置顺序以后，设原数列一共有n项，那么新数列的逆序数是Cn2– k = n(n – 1)/2 – k 。

行楷书写技巧？

行楷又称“汉字行楷手写体字形”，是偏重于楷书书写笔法，比楷书行笔自由，又比行草规正的行书字体。是汉字在楷书基础上简约书写笔画、增强书写映带、表现书写意趣的实用性字体。行楷最大的优势在于实用性极强，书写速度快、易识易学。

行楷特点

行笔轻盈

书写楷书，运笔稳实、缓慢，笔画讲究工整、挺健。书写行楷，运笔轻松、便捷，线条追求流畅、明快。

点画灵动

cn2排列组合公式（排列组合公式）

书写楷书，笔画造型完整，点画之间呼应关系含蓄。书写行楷，点画活泼，连带显露，点、钩、挑等动感笔画明显增多。

字形多变

楷书的字形平正端庄，通篇整齐均匀，相映如一。行楷字的字形变化多姿，通篇大小相间，正敧相错，同一个字可以有多种写法。

硬笔行楷

姿势

坐姿

推荐的坐姿：头正、肩平、臂开、足安；眼离纸一尺高，手离笔尖一寸长，胸离桌子拳头，推荐坐姿如下图。

握姿

推荐的握姿：拇指、食指捏住笔，中指抵住笔杆底；余下两指紧相依，指离笔尖一寸余；五指配合齐用力，不松不紧最适宜，推荐握姿如下图。

工具

选笔

1、钢笔

钢笔的地位在硬笔练字中处于不可撼动的地位，较强表现力可以反映出毛笔的效果。关于练习钢笔的选择，我们可以遵从以下原则：

（1）不使用美工笔。美工笔不利于稳定练习；

（2）不使用写起来不适的钢笔。比如出现堵笔、洇墨、摩阻过大等问题；

（3）不使用过贵的钢笔。在成本练字的过程相对耗笔，尽量做到成本控制，贵的笔对练字本身没有太实质性的帮助。

中性笔

中性笔有稳定、表现力强、便宜、便捷、书写舒适等优点，是一种相对完美的笔。不止在此次行楷练习试验中，日常生活中，大多数人更愿意使用0.5中性笔。

中性笔的挑选可以遵从如下原则：

（1）书写流度。笔触顺骨，笔画饱满，墨色均匀；

（2）握笔舒适度。长时间书写不会有过于明显累手、压迫感；

（3）墨干燥速度。书写时不会被谱黑就行。

3、其他笔

除了钢笔和中性笔，其他笔类都可以进行练字。种类繁多，最为常见的有铅笔，圆珠笔等。不一定局限于某种笔。

字帖

分类

字帖大体可分为三类：（1）笔画结构详解类（2）集字类（3）语录文章类。初学者可以购入三类字帖分别一本，有一定基础者可以购入后两类字帖各一本，基础扎实者可购最后一类字帖。行楷定型试验于2019年6月10日启动，2019年10月24日初步定型，所用字帖为荆霄鹏的《实用行楷字帖》（图1)、《林徽因语录行楷》（图2)。《实用行楷字帖》属于集字类，《林徽因语录行楷》属于语录文章类。

图1

图2

推荐字帖

当代有大量优秀行楷字帖，比如吴玉生、田英章、钱沛云等人的行（楷）字帖。

昊玉生的行楷字站：《怎样写好写快规范字》《公务员汉字书写5500字》、《古文观止》、《硬笔行书红楼梦诗词》等。

田英章的行（楷）字帖：《钢笔行书实用技法字帖》、《漂亮字的快写技巧（行书）》、《现代汉语常用3500字（行书）》等。

钱沛云的行（楷）字帖：《钱沛云硬笔书法技巧》《钱市云教你写好硬笔行书》等。

对于字站的选择需要根据自己的喜好，但是也要避雷。

选择字帖三不选：不选折凹槽类字帖；不选手写体类字帖；不选大幅度描红类字帖。

纸

练习纸种类繁多，常见的有回宫格、米字格、田字格、空白格、横线格、竖线格等等，练习纸的选择也需依据自己的基础，初学尽量选择辅助线多的回宫格、米字格等，随着阶段的变化，练习纸也应该有所改变以减少辅助，达到科学练习的目的。按时间顺序，不止使用了米字格纸、田字格纸、空白格纸、横线纸、竖线纸、白纸。

重点：从脱离米字格到白纸，练字整个过程都贯穿着田字格纸的巩固练习，不属于完全转换状态。

另外，有以下几个点可以注意：

（1）当没有问题的笔墨写在纸上产生洇墨、阻力大等类问题，建议换纸。

（2）不要使用线格过小的纸，选择写起来有种自然舒适状态的纸。

（3）不要刻意追求“好”纸，硬笔行楷的练习对纸的要求较低。

练字内容

从欣赏一幅书法作品的角度，至少会从章法、结构、笔画（划）三方面进行解读，这三方面即是要练字的内容。

章法

章法是安排布置整幅作品中，字与字、行与行之间呼应、照顾等关系的方法，它着重于字与字之间、行与行之间的协调。章法包含着字形大小、字距远近、字态正奇、黑白分布、落款铃印等，利用这些手段可以使众多单字在特定的风格下形成一种和谐稳定美观又不失趣味的作品。

结构

结构是字内各笔画长短、粗细、疏密、布局等。汉字从结构上分有独体字与合体字两大类。从结构形式看，合体字分为七种，即上下结构、上中下结构、左右结构、左中右结构、半包围结构、全包围结构和品字形结构，巧妙地组织笔画让笔画布局合理，传达的视觉效果越好。

笔画（划）

永字反映出了“点、横、竖、撇、捺、提、折、钩”八个基本笔画。笔尖与纸面接触的痕迹，反映出笔画力度、角度、粗细、曲直等。笔画作为练字的起点，是最基础也是最核心的，务必加倍重视。

练字方式

临摹字帖是当下练字最有效的途径，但是部分人在临摹之前往往忽略了一个前提：读帖。将练字方法分解为三个部分：读帖、摹写、临写。

读帖

读帖需要分析字帖范字的笔画、结构、章法。读帖是一个发挥主观能动性的过程，初步练习时应更多的注重笔画的长短、粗细、徐疾、轻重，笔画之间的俯仰、向背、离合、呼应，字的大小、方圆、高矮、宽窄等等。仔细领会字帖的点画形质、间架结构、气韵神采，才能下笔准确。对同一字帖而言，应从其点画开始，观察其起笔、行笔、收笔如何完成以及同一类笔画之间的细小差别等，再到观察毎个字的间架结构、位置布局和章法，最后则是体味字站的气韵神采、风格特点，为准确地临写做好准备。对不同字帖而言，就比如不止选择的两本字帖，往往起到一个相辅相成的作用，为了解一个字体作好充分的准备。经过观察，不止使用的行楷字帖，不像古帖变化较多，容易学习，方便掌握。

摹写

市面上流通的大多数摹写字帖采用透明度较高的硫酸纸覆盖在字帖上，按照影子描写（或者猫红）。当你开始使用摹写时前也要详细的读帖，做到心中有数。摹写过程中，尽量与原帖的用笔一致，单字书写一气呵成，不可存在먹笔填笔等问题。摹写有利有弊，不止认为摹写存在降低主观能动性的嫌疑，故整个练字试验过程都没有使用摹写。

临写

临写根据要求的不同可分为对临、背临和意临。

1、对临

可将字帖置于视角左侧或前端，便于准确观察。随着练字形式的多样化，对临时关于字帖的摆放只要适用于自己即可，可通过裁剪字帖放大观察范围，不必拘泥形式。基于读帖，写完后再将自己写的与字帖仔细对照分析，找到不足做出标记，再次临写，循环练习直到与字帖的字高度相以。临写时不可看一笔写一笔。

2、背临

在读帖，摹写，对临这些过程中，应当有所思索、有所比较、有所记忆，将字帖熟记于心，合帖临写，通过背临这种方式来检验自己是否熟练，这种方式就好比背语文课文，作为一种检查手段的同时，也是在巩固字体的练习，以形成记忆模式，达到一种出笔即像的境界。有部分练习者对照字帖能写得很好，一旦离开字站，不管是字形还是结构都降了层次，这就是因为没有使用好背临这一招。学习一个字体最后目的就是要将帖上字化为已用，想要到达这一目的，背临是必经的过程。背临还有两种形式：空背临和心背临。由于这两种方式不存在使用工具、时间、环境等的要求，完全可以利用碎片时间进行练习与巩固。空背临可用手指、木棍等工具在空中、地上或身上，通过记忆比照字帖写。心背临即在心里描摹字帖，在脑中再现每一笔每一画，这种方式适合睡觉前时用。

3、意临

在临写时注入了自己的主观意识，意临是由临摹过渡到创作的必经之路。诸多初学者存在一个问题：练字时喜欢掺杂自己的意识，这是一种正常的现象，但是也是要趁早正视解决的问题，到达意临这个阶段才开始融入主观思维，切不可过早掺入。意临可从为两种，第一种是在原帖字体风格的基础上，使用自己的笔法或结体特征来表现；第二种是在自己字体风格的基础上，使用原站的笔法和结体特征来适应自己的“意”。

注意事项

三种练字方法的合理利用才能在练字过程取得一个不错的效率，需要我们注意如下几点：

1、多临少摹

不止在为期四个多月的练习期间不采用摹写是因为降低了主观能动性。将摹写与临写进行有机结合，以临写为主、摹写为辅的方式取长补短，未必不是一种好的方法。

2、循序渐进

一般而言，从摹写到临写，各项练习方法应当有效穿插，相互作为辅助关系。

3、先专后博

比如不止选择的两本字帖，先《实用行楷字帖》，后《林数因语录行楷》，两本字帖虽然都是荆香鹏的字，但有差别。先打好基础，解决好笔画结构，再进入长篇幅的练习。同时也可以找书家其他字帖，进行广泛吸收。

4、点面结合

在练习前期，笔画与结构的练习往往是结合在一起。由于诸多现代字帖制作是由字体库生成，相同的字没有变化，极有利于练习（也有弊端，不够灵动）。练习中后期，笔画、结构、章法相互穿插练习，可以进行通临，形成面到点，点到面的良性循环。

5、讲究实效

练字不是抄字，做事要做有用功，每一笔、每一字都需要精益求精，不求数量求质量。当今生活节奏过快，部分人练习时总想急于求成，练字不是一朝一夕的事，讲究效率的同时也要注重坚持。

行楷技巧

连写笔画

写行楷书，往往将相邻的笔画连写，以方便书写。

引用草书

为增强行书的流动笔意，注重牵丝连带，调节行气，也可以把人们比较熟悉的草字直接串写在行楷书中。

简化字形

行楷书书写时，由于连写笔画，可以适当减少笔画数、简化了字形，使书写更加便捷。

改变笔顺

行楷书为了连写方便，有一些字改变了楷书的笔画顺序。总体上要保证美感，章法布局上要讲究错落有致，空间布白。

略带斜势

行楷书在书写时，为行笔连带方便，横可以大幅度上斜，字形略带斜势，自成新的体势。

大小相间

行楷书在排行书写时，字形大小，随其自然，大小相间，使行气更加流畅自然。

章法布局排列

字的大小讲究有大有小，错落有致，相得益彰，这样能够使整体更加美观大方。

规律技巧

左短右长

是指左部偏旁较右部要短、而且小。书写时，左部要写小、并略靠上一些，为右部写宽长一些留出位置。这类字的右部往往有撇画向左部的下方伸展，要恰到好处，不能伸的太长。比如：听、作、观等。

左高右低

点竖对正

指在一个字中，有上下两个中竖者，两个中竖应当垂直对正。竖能对正，则字身不倒。在许多字中，中竖决定字的重心，安放位置对与错就决定了这个字的好坏。

左斜右正

凡左右结构者，以左斜右正者居多，左斜为呼，右正为应，有呼无应，字势必殇，有应无呼，无源之水，均不能立，呼者以斜而取势，应者以平而安神，呈左动而右稳，书呼疾而应迟。

左宽右窄

撇捺不相连

上展下收

横长撇短

上紧下松

书写要点

行楷入门，以吴玉生行楷字为例。

常用字“大”字虽然笔画简单，但并不好写，眼睛一看就会，但是写出来总觉得姿态别扭。

为了方便记忆，下面我把“大”字书写要点归结为“3直1弯”。

①横画要直，用中横，要果断，粗壮有力，不宜带弧度；

②竖撇竖要直；

③捺画前半段要直；

④竖撇跨过横画之后，急转弯，弧度非常大。

毛笔行楷

姿势

坐姿

写毛笔字以坐姿为主。一则练二三寸大楷字无须站立，坐着写就行了；二则坐着省力又利于凝神聚气，注意力容易集中。主张写二三寸大楷模也要用立姿的主要原因是为了练习悬肘，其实坐着写也照样可以用悬肘法，关键是方法要正确。正确的坐姿应该是头正、身直、臂开、足安”（见图下)。

头正：指书写时头要摆正，不可偏侧。

身直：指身体要平正、坐直，两肩齐平，当然直立不是要昂首挺胸，而应该肩背放松，自然下沉，身子略向前倾，胸口与桌面保持一多的间隔，切忌弯腰驼背，甚至将下巴枕靠在左手背上。

臂开：指手臂要往前伸开些，同时两臂的肘关节也要向左右撑开，两边基本匀称。

足安：是指两只脚自然地平稳着地，两腿左右略微分开，其位置与肩宽基本相等，肌肉放松。

站姿

站着写毛笔字身子可略往前倾，头部正直稍微有些下俯，左手掌按住桌面上的纸，右手近于伸直，执笔的姿势也要随着站立而改变，手享下覆，手背与手臂几乎成一平面。两脚分开站稳，双足之间的距离与肩宽大致相等。书写时用手腕、手臂的运动来完成；如果写特别大的字，甚至要用腰部的运动来书写，两脚可再分开些，使书写动作可大一些。执笔方法也应随之而变化。

工具

选笔

毛笔

不同阶段，不同水平，学习不同的书体，练习大小不同的字，对应的毛笔也是不同的。

推荐实体店购买，而非网店购买。网店上的东西看不清摸不着，仅能通过几张图片来判断，这种判断方法很难看的真切，因此很多人发现上了当。而在实体店可以好好观察，也可以根据不同的价格的毛笔进行一个对比，从而择优购买，有问题也能在现场发现。

用笔最好还是选择品牌笔，价格虽是稍高点，但质量比较可靠，包括用料和工艺。

范本

平时多看名帖、看书法展、看名家挥毫。从好作品中汲取养分。推荐的以下范本。

书写原则

1、线条坚而浑——激情原自线条的熟练。线是力和势的组合，行笔要沉着痛快，做到稳健、轻便，重笔势(即趋向)，根据字形大小排字的走向，线条斜势，整体纵向走势。

2、结体奇而稳——注意重心。欹侧、擒纵、疏密、高低。

3、章法变而贯——竹节式(几个字一节)节数间有空隙;贯珠式(中心线);蛇行式(左右摆动);疏影式(疏疏朗朗)。

布局要点

1、一字不能成行。

2、字与字之间有呼应，上承下启，左映右带，行距和字距不能相等。书眼放中央，可大些，字与周边气贯。

cn2排列组合公式（排列组合公式）

3、整体上展出适合墨迹浓重的作品。挂家中适合疏淡的作品。

4、作品中不能有错别字，异体字不过于冷僻。

5、作品整体布局上面重下面轻。

6、评作品好坏主要看总体视觉效果：节奏、墨色、用笔。

7、三三两两，似散还续，气脉一贯，此布局之妙也。

书写技巧

行楷的连带

笔画连带是行楷书的核心，唯有连带，方能提高书写速度。除了一般上下笔划之间的连带之外，还有一些特殊的连带。

1、改变笔顺。如分、交、布、必、巨、王等字，笔顺改变后，连带顺畅，书写便利。

2、笔画合并。如页、吊、此、高、非等字，笔画合并后，两笔并作一笔，使得上下连贯。3、笔画省略。如即、动、蜂、龄、它等字的点、小竖、短撇等次要笔画，为了不妨碍连笔，就省略掉了，虽然省略了，但是仍易于辨认。

4、笔画替代。如风、喜、基、具、常、王、能、可等字，这写字大都采取了描摹轮廓的方式来写，用象形笔法勾勒出来，由于约定俗成，已被大家所接受。

要练好行楷，关键要仔细观察字的行笔路线，注意上下衔接，突出主要笔画，减少对笔画的修饰，尽量一气呵成，使字浑然一体。由于书写点画简略，随意自然，行楷给人们以轻松愉快的感觉。

书写特点

行楷的书写特点是连、变、省，其笔画比正楷字的笔画自由，用笔方法也有许多变化。下面我们逐一介绍行楷的基本笔画。

行楷的点画

行楷画卷头尖、腹平、背圆、尾满，前后顾盼。点画都与字的中心呼应。下面是行楷字点画的主要写法：

行楷的横画

行楷字横画多数带钩，与前后笔画呼应或者连接，有长短、精细、俯仰等变化，如果数横并列，要有长短参差，笔势也要有区别。横画在字中往往起平衡作用，因此书写时要注意长短、角度和曲弧。

行楷的竖画

行楷字写竖画不宜太直硬，要适当取斜势或弯曲，收笔有悬针，有垂露，有带钩，有弯弧，但必须把力用到笔端，切忌软散。字中的长竖作适当夸张。

行楷的撇画

行楷字的撇有多种姿态，要注意长短、曲直的变化，书写时常常回锋，做到伸缩有度，与捺相配时要有变化，不能呆板。

行楷的捺画

捺多用在字的右部或者右下角的末笔，有时写成反捺或长点出锋，但要注意带曲，回锋的方向要有变化。

行楷的提画

提又称挑，常在左右结构字左旁的末笔，与右半边联系。写提笔要快而有劲

行楷的折画

行楷字的折画有圆有方，圆转多于方折，圆度要润，方折要顿。

行楷的钩画

行楷字的钩画多变并适度夸张。有些字本来没有钩，可以加钩起连带作用，但要生动求变，饱满有劲，切忌软弱、尖细。

书写关键

八面出锋

借助于八面出锋，自然显出墨色浓淡，湿中有干，干中有湿，浓中有淡，淡中有浓，变化千万，使作品富有节奏感。

刚柔相济

刚力—铁划银钩(粗)：柔力—行云流水(细)。

惜墨如金

要求蘸一次墨写一个字，甚至数字。

豁然开朗

留白处有宽有窄，宽处给人以忽然开朗之感。艺术是制造矛盾，到解决矛盾的过程。

cn2排列组合公式（排列组合公式）

中侧并用

中锋得法立骨，侧锋得势求变。中锋是理性的要求，是书法审美的核心所在；侧锋是情性的化身，是书法通神的手段。

深思熟虑

创作前要深思熟虑，反复推敲，做到“胸有成竹”。

一气呵成

书法是感情的流露，不是技巧的表现，要在身体与心情皆好的状态下写字。书写时随意挥洒，一气呵成。

错落有致

一般情况下，作品的行距要宽，字距要紧。字忌并列，要错开。节数间有空隙，排列组合要有节奏，大小字参差，突出中间书眼。

笔情墨趣

书法是无声的音乐，无形的舞蹈。求变化中有呼应，使整体和谐，有强烈的节奏和视觉冲击力。用好拙笔，用笔略慢，动中有静，写出墨趣。

重视贯气

书法的气，是指点划与不同字之间的呼应，字与字之间的趋向。

书写方法

读帖

要练眼，即认真读帖。读帖是基础，要仔细观察字在方格中的高低位置、笔画的连贯映带、疏密和长短等，眼高是手高的前提，对字形要善于观察、分析和比较，大致相同的字合成一类，举一反三，达到事半功倍的效果。

练脑

要练脑或说练心。在细心观察的基础上，要把示范字牢牢地记在心里，只有把字形象记英语单词、背数学公式那样烂熟于心，深深地刻在大脑里，才能熟练运用。无论何时，一旦提到这个字，马上就能想出这个字在字帖上的形状，做到胸有成帖，脑有成字。

练手

练眼和练脑是为了搞清字该怎样写，心中能想出字的最好效果，手下却不一定能写出来，因为脑不一定能指挥得了手，手不一定能指挥得了笔。练手就是要达到心手一致、手笔一致的境界，所以练手也是至关重要的。练手主要是练指力、练腕力、练手感。

练结构

要写好行楷，结构的练习重于笔画的练习。字的结构是指字的笔画的长短比例及笔画间的穿插避让关系。要掌握汉字的结构，大家可以写写黑体字，通过这种字体把结构进行校正，然后加以变化，写其他的字体也就容易一些。

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[{"type" "布局要点","id" "https 360},"text" "doxcns2q6MuQS2OYkUFUYR1XDYd"},{"type" {"level" [{"type" "书写技巧","id" "","id" "heading","attrs" 3},"children" "text","text" ""}],"text" "doxcnG0o6uA0YYe8CuWrldoHTie"},{"type" [{"type" "笔画连带是行楷书的核心，唯有连带，方能提高书写速度。除了一般上下笔划之间的连带之外，还有一些特殊的连带。","id" "","id" "paragraph","children" "text","text" ""}],"text" "doxcncsCykwUwgQyCkXIu4UVJFc"},{"type" [{"type" "2、笔画合并。如页、吊、此、高、非等字，笔画合并后，两笔并作一笔，使得上下连贯。3、笔画省略。如即、动、蜂、龄、它等字的点、小竖、短撇等次要笔画，为了不妨碍连笔，就省略掉了，虽然省略了，但是仍易于辨认。","id" "","id" "paragraph","children" "text","text" ""}],"text" "doxcniYscSugg4ga4kJKzB7wtCb"},{"type" [{"type" "要练好行楷，关键要仔细观察字的行笔路线，注意上下衔接，突出主要笔画，减少对笔画的修饰，尽量一气呵成，使字浑然一体。由于书写点画简略，随意自然，行楷给人们以轻松愉快的感觉。","id" "","id" "heading","attrs" 2},"children" "text","text" ""}],"text" "doxcnE4o0MYkUE0UmWeKpQb4cxg"},{"type" [{"type" "行楷的书写特点是连、变、省，其笔画比正楷字的笔画自由，用笔方法也有许多变化。下面我们逐一介绍行楷的基本笔画。","id" "","id" "heading","attrs" 3},"children" "text","text" ""}],"text" "doxcnA0C64w46QSqsstlt7yH0yg"},{"type" [{"type" 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元素周期表136号元素名称及符号？

1、112鎶元素，符号：Cn 2、113鉨元素，符号：Nh 3、114鈇元素，符号：Fl 4、115镆元素，符号：Mc 5、116鉝元素，符号：Lv 6、117钿元素，符号：Ts 7、118气奥元素，符号：Og 化学元素周期表是根据原子序数从小至大排序的化学元素列表。列表大体呈长方形，某些元素周期中留有空格，使特性相近的元素归在同一族中，如碱金属元素、碱土金属、卤族元素、稀有气体等。 这使周期表中形成元素分区且分有七主族、七副族、Ⅷ族、0族。由于周期表能够准确地预测各种元素的特性及其之间的关系，因此它在化学及其他科学范畴中被广泛使用，作为分析化学行为时十分有用的框架。