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阅读短文,完成第1—5小题。
Adam Braun set up the organization(组织) Pencils of
Promise in2008. Its goal is to
make sure all children have a chance for education. Six years later , the
non-profit organization is building a new school somewhere every 90 hours.It has
helped more than 22.000 children in Africa,Asia and Latin America.
It all started when Adam Braun was a college
student. He was visiting India when a boy stopped him and asked for money on
the street, Mr. Braun asked the boy what he would want, if he could have anying
in the world.
“I thought the answer was going to be ‘a house’
or ‘a car’ or ‘a boat’. His answer was ‘a pencil’ So I gave him my pencil and
he was just happy and excited . I& realized he never had been to school
before ,and that was the reality(现实) for 57 million children
around the world. ” Braun said.
Adam Braun started working in finance(金融) after he graduated from college, But he never forgot the
boy and the problem he realized.
“We live in a world in which every child can
have a chance to get a good education ,because we have everything necessary
already.We are able to educate every child .& So I promised to help create
that world .” Braun said.
&Mr Braun raised money for his project. He
paid for building the first Pencils
of Promise school,in Laos, five years ago. Since then ,his organization has
helped pay for more than 200 schools in the countryside of Laos,Nicaragua,Guatemala and Ghana.
did Adam Braun set up the organization Pencils of Promise?
____________________________________________________________
often is the organization building a new school somewhere six years later?
____________________________________________________________
would the boy in India want if he could have anything in the world?
____________________________________________________________
4. What did the boy’s answer make Adam realize?
____________________________________________________________
did Adam Braun set up the organization Pencils of& Promise?
____________________________________________________________
1 In 2008 &&&&2. Every 90 hours&&&&
3. A& pencil.
4. Her realized the boy never had been to school
before and that was the reality
for 57 million children around the world.
5. Because he wants to / Its goal is to make
sure all the children have a chance for education. gNetc oo co .Net组 卷f
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>>>先能明白(1)小题的解答过程,再解答第(2)小题,(1)已知a2-3a+1=0..
先能明白(1)小题的解答过程,再解答第(2)小题,(1)已知a2-3a+1=0,求的值,解:由a2-3a+1=0,知a≠0,∴a-3+=0,即a+=3,∴;(2)已知:y2+3y-1=0,求的值。
题型:解答题难度:中档来源:同步题
解:由y2+3y-1=0,知y≠0,∴y+3-=0,即-y=3,∴,即,∴,∴,由,∴。
马上分享给同学
据魔方格专家权威分析,试题“先能明白(1)小题的解答过程,再解答第(2)小题,(1)已知a2-3a+1=0..”主要考查你对&&完全平方公式&&等考点的理解。关于这些考点的“档案”如下:
现在没空?点击收藏,以后再看。
因为篇幅有限,只列出部分考点,详细请访问。
完全平方公式
完全平方公式:两数和(或差)的平方,等于它们的平方和,加上(或减去)它们的积的2倍。叫做完全平方公式.为了区别,我们把前者叫做两数和的完全平方公式,后者叫做两数差的完全平方公式。(a+b)2=a2+2ab+b2,(a-b)2=a2-2ab+b2。
(1)公式中的a、b可以是单项式,也就可以是多项式。(2)不能直接应用公式的,要善于转化变形,运用公式。该公式是进行代数运算与变形的重要的知识基础,是因式分解中常用到的公式。该知识点重点是对完全平方公式的熟记及应用。难点是对公式特征的理解(如对公式中积的一次项系数的理解)。结构特征:1.左边是两个相同的二项式相乘,右边是三项式,是左边二项式中两项的平方和,加上或减去这两项乘积的2倍;2.左边两项符号相同时,右边各项全用“+”号连接;左边两项符号相反时,右边平方项用“+”号连接后再“-”两项乘积的2倍(注:这里说项时未包括其符号在内);3..公式中的字母可以表示具体的数(正数或负数),也可以表示单项式或多项式等数学式.记忆口诀:首平方,尾平方,2倍首尾。使用误解:①漏下了一次项;②混淆公式;③运算结果中符号错误;④变式应用难于掌握。
注意事项:1、左边是一个二项式的完全平方。2、右边是二项平方和,加上(或减去)这两项乘积的二倍,a和b可是数,单项式,多项式。3、不论是还是,最后一项都是加号,不要因为前面的符号而理所当然的以为下一个符号。完全平方公式的基本变形:(一)、变符号例:运用完全平方公式计算:(1)(-4x+3y)2(2)(-a-b)2分析:本例改变了公式中a、b的符号,以第二小题为例,处理该问题最简单的方法是将这个式子中的(-a)看成原来公式中的a,将(-b)看成原来公式中的b,即可直接套用公式计算。解答:(1)16x2-24xy+9y2(2)a2+2ab+b2
(二)、变项数:例:计算:(3a+2b+c)2分析:完全平方公式的左边是两个相同的二项式相乘,而本例中出现了三项,故应考虑将其中两项结合运用整体思想看成一项,从而化解矛盾。所以在运用公式时,(3a+2b+c)2可先变形为[(3a+2b)+c]2,直接套用公式计算。解答:9a2+12ab+6ac+4b2+4bc+c2
(三)、变结构例:运用公式计算:(1)(x+y)(2x+2y)(2)(a+b)(-a-b)(3)(a-b)(b-a)分析;本例中所给的均是二项式乘以二项式,表面看外观结构不符合公式特征,但仔细观察易发现,只要将其中一个因式作适当变形就可以了,即(1)(x+y)(2x+2y)=2(x+y)2(2) (a+b)(-a-b)=-(a+b)2(3) (a-b)(b-a)=-(a-b)2
发现相似题
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