如图所示

f(x)=d /a(x-1)(x-5)=d/ax^2-6ax+5ab=-6ac=5a a:b=1:-6 a:c=1:5 d/-4a=2 a:d=1:-8a:b:c:d=1:-6:5:-8

光剑啊，我觉得可以理解为激光武器，但是不知道我理解的对不对

解：作辅助线延长AE交BC于G由三角形外角原理，有∠A+∠B=∠AGC∠AGC+∠C=∠DNF∠DNF、∠D、∠E、∠F是四边形DEFN的四个内角，所以∠DNF+∠D+∠E+∠F=(4-2)×180°=360°所以，∠A+∠B+∠C+∠D+∠E+∠F=∠AGC+∠C+∠D+∠E+∠F=∠DNF+∠D+∠E+∠F=360°。答：∠A+∠B+∠C+∠D+∠E+∠F=360°。

大小不一样

连接AC，BD因为E是AB的中点，H是AD的中点所以EH就是△ABD的中位线所以EH∥BD且EH=1/2BD同理在△CBD中，也可以得出FG∥BD且FG=1/2BD所以EH=FG且EH∥FG用同样的方法借助AC，可以得出EF=HG且EF∥HG又因为ABCD是菱形所以AC⊥BD所以EH和FG都垂直于EF和HG所以∠HEF=∠EFG=∠FGH=∠GHE=90°所以四边形EFGH是矩形加油！

用勾股定理可以证明的

看提示：The URI is empty.框架提示你了，说URI这个对象是空值。你在源码里检查下这个URI是不是没赋值。

A、人的推力使字典由静止变为向它运动，所以体现了力可以改变物体的运动状态．故A正确．B、字典对桌面的压力与桌面对字典的支持力，这两k力大小相等，都等于物体的重力；方向相反，压力竖直向下，支持力竖直向上，两者反向共线．但这两k力没有作用在同5k物体上，它们是5对作用力与反作用力．故B错误．十、在推动字典的过程中，字典对桌面的压力不变，始终等于物体的重力；字典与桌面之间的粗糙程度不变，所以摩擦力不变．故十错误．D、根据对十的分析可知D正确．故选AD．

由图可知：a、d在并联电路的干路上，b、c分别在两支路上，由并联电路中电流的特点知，干路中的电流等于各支路电流之和；所以，A选项的关系正确，B、D选项中的关系错误．虽两灯并联，两灯两端的电压相等，但由于灯泡的阻值不知，所以不能判断通过灯泡的电流大小；故C选项错误．故选：A．

（1）数轴上的点A，B，C，D表示的数分别是：1，2.5，-1，-3；（2）2.5-1=1.5，所以A，B两点间的距离是1.5个单位长度；（3）1-（-3）=1+3=4，所以A，D两点间的距离是4个单位长度．故答案为：（1）1，2.5，-1，-3；（2）1.5；（3）4．

原题：解答：

（1）A是天然气的主要成分，所以A就是甲烷，B是造成温室效应的气体之一，所以B就是二氧化碳，C为常用的建筑材料，且由A能依次转化至D，所以C就是碳酸钙，D可能为氯化钙，经过验证各物质都满足：AB C DCH 4 →CO 2 →CaCO 3 →CaCl 2 1644 100111甲烷和氧气在点燃的条件下生成二氧化碳和水，化学方程式为：CH 4 +2O 2 点燃 . CO 2 +2H 2 O（2）D是氧化物且为红色固体，所以D就是氧化铁，氧化铁会转化为氧化物C，氧化物C又会转化为氧化物B，根据分子质量的关系，所以C就是二氧化碳，B就是水，水会转化成A，且A的相对分子质量小于水，所以A就是氢气，各种物质都满足： H 2 ←H 2 O←CO 2 ←Fe 2 O 3 21844160氢氧化钙和二氧化碳反应生成碳酸钙和水，Ca（OH） 2 +CO 2 =CaCO 3 ↓+H 2 O；（3）D的相对分子质量为98，会与单质C反应，所以D就是硫酸，C是活泼金属，A至D相邻物质均能发生化学反应，所以B就是氧气，单质A会与氧气反应，所以A是H 2 、C、Mg、Al、P等物质，各种物质都满足： H 2 -O 2 -Fe（Zn）-H 2 SO 4 23256（65）98C和D反应的化学方程式为：Fe+H 2 SO 4 =H 2 ↑+FeSO 4 （或Zn+H 2 SO 4 =H 2 ↑+ZnSO 4 ）；故答案为：（1）CaCO 3 ；CH 4 +2O 2 点燃 . CO 2 +2H 2 O；（2）H 2 ，Ca（OH） 2 +CO 2 =CaCO 3 ↓+H 2 O；（3）O 2 ，Fe+H 2 SO 4 =H 2 ↑+FeSO 4 （或Zn+H 2 SO 4 =H 2 ↑+ZnSO 4 ）；H 2 、C、Mg、Al、P（写出两个就给分）．

解：因为三角形CBD为直角三角形，且角CBD＝30度，所以CD=1/2BD(直角三角形中30度角所对的直角边等于斜边的一半）所以BC^2＝BD^2-CD^2=(2CD)^2-CD^2=3CD^2，所以BC=√3CD，所以AD/DC＝(AC-DC)/DC=(BC-DC)/DC=(√3DC-DC)/DC=(√3-1)DC/DC=√3－1

可以小写的

m 2 ． 试题分析：一个半圆形零件，直径紧贴地面，向前作无滑动翻转，使圆心O再次落在地面上止，圆心O经过的路径可分为以A为圆心、以3m为半径，圆心角为90°的弧OO 1 ，线段O 1 O 2 ，以B为圆心、以3m为半径，圆心角为90°的弧O 2 O 3 ，然后利用圆心O所经过的路线与地面围成的面积=S扇形AOO 1 +S矩形ABO 2 O 1 +S扇形BO 2 O 3 和扇形的面积公式进行计算．如图： 圆心O先以A为圆心、以3m为半径，圆心角为90°的弧OO 1 ，接着圆心O从O 1 平移到O 2 ，且O 1 O 2 的长为半圆的长，然后圆心O以B为圆心、以3m为半径，圆心角为90°的弧O 2 O 3 ，所以圆心O所经过的路线与地面围成的面积=S扇形AOO 1 +S矩形ABO 2 O 1 +S扇形BO 2 O 3 = （m 2 ）．

①②④ ①过O作平面ABC的垂线(O′为垂足),延长至D使O′D=OO′,连接AD,BD,CD,则四面体DABC有三个面是直角三角形,故①正确;②在以O、A、B、C确定的球上,显然存在点D满足条件,故②正确;③因为AB=AC=5,BC=3 ,所以当点D满足BC=BD=CD=3 且AD=5,四面体是以△BCD为底面的正棱锥,这样的D点有两个,所以③不正确.④取BC的中点O 1 ,在平面AOO 1 内以A为圆心,以BC为半径作圆,圆周上任一点满足条件,所以这样的点D有无数个,故④正确.

由图可知R1、R2串联，电压表测R2两端的电压，电流表测电路中的电流．①因串联电路中总电压等于各分电压之和，所以，R1两端的电压：U1=U-U2=15V-9V=6V，因串联电路中各处的电流相等，所以，电路中的电流示数：I=U1R1=6V10Ω=0.6A；②变阻器连入电路中电阻R2的阻值：R2=U2I=9V0.6A=15Ω；③由滑动变阻器的铭牌可知，允许通过的最大电流为1A，要使电流表能达到量程满刻度值，则量程只能选0～0.6A；a．若电压表的量程为0～3V，当滑动变阻器接入电路中的电阻为0，电流表的示数满刻度时，电源的电压最小，则最小电压Umin=ImaxR1=0.6A×10Ω=6V；当电压表的示数达到满刻度，同时电流表示数达到满刻度时，电源的电压最大，则最大电压Umax=ImaxR1+U2max=0.6A×10Ω+3V=9V；即电源电压的变化范围为6V～9V；b．若电压表的量程为0～15V，当滑动变阻器接入电路中的电阻最大，且电压表达到满刻度时，电源的电压最小，则电路中的电流I=U2maxR2max=15V30Ω=0.5A，电源的电压Umin=IR1+U2maxx=0.5A×10Ω+15V=20V；当电流表的示数达到满刻度，且电压表的示数同时达到满刻度时，电源的电压最大，则电源的电压Umax=ImaxR1+U2max=0.6A×10Ω+15V=21V；即电源电压的变化范围为20V～21V．答：①电流表A的示数为0.6A；②变阻器连入电路中电阻R2的阻值为15Ω；③电压表选0～3V量程，电流表选0～0.6A量程时，电源电压的变化范围为6V～9V；电压表选0～15V量程，电流表选0～0.6A量程时，电源电压的变化范围为20V～21V．

as the figure displayed/showed

as illustrated in this picture as illustrated in picture 1-1 as illustrated in the picture below picture 1-1 illustrateds ...

真是，简单短语那么多的译法。"shown as Fig. XX"

驱动问题

,Oakley sunglasses cheap first with 500 per 1 million it has accumulated slowly, a day to eat a fat man Dianxuan. any novice into the apparel industry must be as much as possible before reading the book some of the clothing, from books to understand the common sense clothing, fashion trends, dressing mix, as well as wholesale bargain skills, such as how to understanding of the psychological wholesalers, and wholesalers on how to make you feel good, lasting relationship of trust and so on. I have been man-made, the book is the best way to systematic learning. But do not believe books are really not as good as the book, if able to learn a lot older and experienced clothing techniques, it has a practical significance. Any learning is to apply their knowledge. Must form your own unique experience. The process of learning and almost carry with you any time, any place, the knowledge economy is no exception under the apparel industry. 3 soft, slow in the purchase, you should be according to the actual situation to be an accurate Nahuo plan. For example, you want potential customers according to your spending power to determine the price of getting goods, because a direct impact on the prices of goods to take your sales price, while the most direct impact on your profits. If your potential customer"s purchasing power is too low, take the high prices of goods due to the retail price is too high, or high consumption levels, but the product"s retail price is too low, which can lead to low risk transactions. There are potential customers of the clothing styles, style, fabric, color requirements and so on. Anyway, the more you learn, the more unique look, the more accurate, more ruthless, the more your potential customers to meet the needs of the phase, the probability of success will be greater. Hard and sometimes also in other quasi-extreme on the one hand, reflected in bold, we often just sit and watch other people can see the good people who capture opportunities from time to time, always half a beat quicker than us, there is great when your summer When the stock he had clearance to start the autumn, until the market is flooded over a large number of homogeneous product, he would have reaped the profits full. At this time we regret not used green bowels. Quick step, quick step by step people. 2 aggressive, accurate, fast a grain of sand the world. some of the small seemingly insignificant business, often implies the truth of the world"s largest business. Taiwan"s Acer Computer chairman Stan Shih in my youth, had helped his mother sell duck eggs and stationery. 3 per 1 kg of duck eggs,mac blusher, they can only make three angles, and only 10% of the profits, and perishable, there is no time to sell will be broken, causing economic loss; stationery, high-profit, doing business at least 10 yuan profit 4 yuan, profits of more than 40%, and stationery arrayed not bad. Looks to sell duck eggs than to make money selling stationery. But in fact, Shih said later about the experience, selling stationery make more money than selling duck eggs. Duck Although profit margins, but the turnaround time for up to two days; stationery Although profitable, but sometimes not sell half or even a year, not only the backlog costs, profits earlier, corrosion is a space of interest. Duck eggs sold in thin profits, so profits far greater than the slow turnover of stationery. Shih was the experience of the use of duck eggs sold to the macro?, Established a To reduce the actual profit than peers. Shih mother sell duck eggs in the doorway, having a business behind a common theorem: return on equity = profit margin × turnover rate. Junior Stan Shih"s business intelligence is reflected in, he could also consider the profit margins and turnover. (b) But many Chinese business people have no such intelligence, they often ask: neglect on the turnover rate, which focused on the profit margins of large projects (industry) on the. But the profit margins of large projects, often due to high prices and slower turnover, once the funds can not be healthy at this time, the rapid turnover up their end retailers will not only be stockpiled crushed to death, and the whole industry chain will be a crisis If the above 4 refined, like, wide clothes all want quality, do unique, but proved popular clothing is often best selling lines. Yes, buy clothes when we always want to personalize point, a unique point, it is best not to so and so and so and so Zhuangshan, but we have to buy clothes and sell clothes out of the mindset of the cycle. I remember when your purchase is helping your customers as they Tiaoyi Fu do not you wearing, what empathy may not have the intention of the harvest. But you might argue, I look down, my customers I can not convince them, which was a little dead end. Emphasis here is popular wide, wide net. Popular is not necessarily all good, such as pandemic flu, but the epidemic is the public to see what you face a market. So, do like the basis of broad, so refined, so special, is particularly important,Mac cosmetics, such as a style, I am very optimistic, but really needs to be market test, I can use a variety of strategies to take less, some as carefully as possible. As long as possible with my supplier replenishment on OK. aggressive, accurate and fast Shaolin Juexue purchase of clothing, then, these two can definitely be called a clothing purchase the apparel industry and even a martial art Tai Chi. Clothes be full of patience, because the fall was often terrible, terrible fall get up again. If the shop, encountered problems, such as the opening of the first month did not make money, it also will not be disappointed, to analyze the causes and find ways to solve the problem, provided that always has a solution. A few people into the store, or into the store turnover rate, or products, sales, display, store location and other reasons. This time can not solve their own problems with your supervisor supplier negotiation, but do not point finger at all the suppliers. You know, this time, we are all grasshoppers on a rope, a prosperity, a loss for both, only a win-win is crucial. Slow and soft is also reflected in the accumulation of the apparel industry, you can always find that many boutiques have their own loyal customers, yes, it is the outcome of long-term accumulation. Clothing, food, shelter, transportation, a row in the first place, many customers outside of their dermal layer of skin is still very concerned about this. And you are familiar with the degree of knowledge of clothing, the clothing culture of the accumulation level, are working slowly and deliberately to the. 1 study, with the

中中、中2之比为中中：中2=c8t（90°-θ）：c8tθ=c8t80°：c8t30°=中：3中中、中2串联起来接入电路中时电流相等，根据功率公式P=I2中得，中中、中2消耗的电功率之比P中：P2=中中：中2=中：3．故选C

那些插槽都是用来扩建电脑的,你目前不需要,白色的可以插网卡也可以插内存卡,那个白色条条是传输数据用的

combine是联合两个同类对象组成一个新的对象。c应该包含a、b两个矩阵。就是b在a下面。然后空的地方补零。所以如果a=[1 2];b=[3;4];c= 1 2 3 0 4 0

368怎么变成363了

<!DOCTYPE html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>纯CSS3实现的各种阴影效果</title><style>body {padding: 20px 0 0;font: 14px/1.5 Arial, sans-serif;text-align: center;color: #333;background: #FAF0D9;}a {font-weight: bold;color: #346AA8;}a: hover,a: focus,a: active {text-decoration: none;}.container {position: relative;z-index: 1;width: 600px;padding: 20px;margin: 0 auto;background: #FAF0D9;}.container: after {content: "";display: block;clear: both;visibility: hidden;height: 0;font-size: 0;}/* Shared styles*/.drop-shadow {position: relative;float: left;width: 40%;padding: 1em;margin: 2em 10px 4em;background: #fff;-webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 60px rgba(0, 0, 0, 0.1) inset;-moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;}.drop-shadow: before,.drop-shadow: after {content: "";position: absolute;z-index: -2;}.drop-shadow p {font-size: 16px;font-weight: bold;}/* Lifted corners*/.lifted {-moz-border-radius: 4px;border-radius: 4px;}.lifted: before,.lifted: after {bottom: 15px;left: 10px;width: 50%;height: 20%;max-width: 300px;-webkit-box-shadow: 0 15px 10px rgba(0, 0, 0, 0.7);-moz-box-shadow: 0 15px 10px rgba(0, 0, 0, 0.7);box-shadow: 0 15px 10px rgba(0, 0, 0, 0.7);-webkit-transform: rotate(-3deg);-moz-transform: rotate(-3deg);-o-transform: rotate(-3deg);transform: rotate(-3deg);}.lifted: after {right: 10px;left: auto;-webkit-transform: rotate(3deg);-moz-transform: rotate(3deg);-o-transform: rotate(3deg);transform: rotate(3deg);}/* Curled corners*/.curled {border: 1px solid #efefef;-moz-border-radius: 0 0 120px 120px / 0 0 6px 6px;border-radius: 0 0 120px 120px / 0 0 6px 6px;}.curled: before,.curled: after {bottom: 12px;left: 10px;height: 55%;max-width: 200px;-webkit-box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);-moz-box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);-webkit-transform: skew(-8deg) rotate(-4deg);-moz-transform: skew(-8deg) rotate(-4deg);-o-transform: skew(-8deg) rotate(-4deg);transform: skew(-8deg) rotate(-4deg);}.curled: after {right: 10px;left: auto;-webkit-transform: skew(8deg) rotate(4deg);-moz-transform: skew(8deg) rotate(4deg);-o-transform: skew(8deg) rotate(4deg);transform: skew(8deg) rotate(4deg);}/* Perspective*/.perspective: before {left: 80px;bottom: 8px;width: 50%;height: 35%;max-width: 200px;-webkit-box-shadow: -80px 5px 10px rgba(0, 0, 0, 0.4);-moz-box-shadow: -80px 5px 8px rgba(0, 0, 0, 0.4);box-shadow: -80px 5px 8px rgba(0, 0, 0, 0.4);-webkit-transform: skew(50deg);-moz-transform: skew(50deg);-o-transform: skew(50deg);transform: skew(50deg);-webkit-transform-origin: 0 100%;-moz-transform-origin: 0 100%;-o-transform-origin: 0 100%;transform-origin: 0 100%;}.perspective: after {display: none;}/* Raised shadow - no pseudo-elements needed*/.raised {-webkit-box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 60px rgba(0, 0, 0, 0.1) inset;-moz-box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;}/* Curved shadows*/.curved: before {top: 10px;bottom: 10px;left: 0;right: 50%;-webkit-box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);-moz-box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);-moz-border-radius: 10px / 100px;border-radius: 10px / 100px;}.curved-vt-2: before {right: 0;}.curved-hz-1: before {top: 50%;bottom: 0;left: 10px;right: 10px;-moz-border-radius: 100px / 10px;border-radius: 100px / 10px;}.curved-hz-2: before {top: 0;bottom: 0;left: 10px;right: 10px;-moz-border-radius: 100px / 10px;border-radius: 100px / 10px;}/* Rotated box*/.rotated {-webkit-box-shadow: none;-moz-box-shadow: none;box-shadow: none;-webkit-transform: rotate(-3deg);-moz-transform: rotate(-3deg);-o-transform: rotate(-3deg);transform: rotate(-3deg);}.rotated: first-child: before {content: "";position: absolute;z-index: -1;top: 0;bottom: 0;left: 0;right: 0;background: #fff;-webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 60px rgba(0, 0, 0, 0.1) inset;-moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;}</style><script>var _gaq = _gaq || [];_gaq.push(["_setAccount", "UA-7489188-1"]);_gaq.push(["_trackPageview"]);(function() {var ga = document.createElement("script");ga.async = true;ga.src = "http://www.google-analytics.com/ga.js";var s = document.getElementsByTagName("script")[0];s.parentNode.insertBefore(ga, s);})();</script></head><body><div class="container"><h1><a href="/css-drop-shadows-without-images/">CSS drop-shadows without images</a></h1><div class="drop-shadow lifted"><p>Lifted corners</p></div><div class="drop-shadow curled"><p>Curled corners</p></div><div class="drop-shadow perspective"><p>Perspective</p></div><div class="drop-shadow raised"><p>Raised box</p></div><div class="drop-shadow curved curved-vt-1"><p>Single vertical curve</p></div><div class="drop-shadow curved curved-vt-2"><p>Vertical curves</p></div><div class="drop-shadow curved curved-hz-1"><p>Single hozitonal curve</p></div><div class="drop-shadow curved curved-hz-2"><p>Horizontal curves</p></div><div class="drop-shadow lifted rotated"><p>Rotated box</p></div></div></body></html>自己可以模仿成自己的效果

区别是一个是概率密度函数，一个是累积概率值。