1、alleviation crucial further development to a ccelerate the proce ss of well -off society ha s created a great opport unity. 18 si nce t he ce ntral and provi ncia l poverty all eviation a nd devel opment i nto the overall strategic planning, priority a nd "first proje ct", formulated a ser

2、ies of poli cies now focus, development mea sures have all be en clear. we want to seize the opport unit y, pre cisi on a ppli cation strategy, focus punch, break "support . , s upports t he devel opme nt of ol d revoluti onary a nd a series of poli cy measure s in areas such as i nfrastruct ur

3、e, publi c servi ces, promoti ng hig h standards, support, and more opportunities for us to a ccelerate development, provide greater support. from provi nce s policy oriented see, "1236" poverty st orming, a nd "6873" traffic breakthr oug h, and "6363" water guara ntees

4、, major a ction speed up implementation, e col ogical security barrier, and long ea st energy chemical base constructi on, major strategy intensive introduced, and provincial "eig ht a change", and "eighta both" and munici pal "six a into", a nd "six big support&qu

5、ot; of de cisi on depl oyment, conce ntrated release has many poli cy good. in parti cular gansu silk roa d economic belt of gold a nd heritage of chinese civili zation construction of adva nci ng the i nnovati on zone , jing chuan based a dvantage, create node cities a nd provi de a br oader spa ce

6、 in core area s. from i county proje ct resource s see, national e col ogical civilizati on pilot e ngineeri ng model county a nd cycle e conomi c mode l county tw o a national pr oje ct landing impl ementation, will i n country province level w on m ore support; pi ngliang to jingchua n city inter

7、fast cha nnel, a nd xi ping railway double tra ck, major pr oje ct into provinces plate, will furt her upgrade i county traffic hub and c hannel economic stat us; paper brigade i ntegrated body, and zhu jia jian reserv oir, a nd agri cult ural pv power, and ga s utilizati on, and commodity trading a

8、nd the agricult ural wholesa le market, and million tonnes of controlle d atmosphere fruit a nd freezi ng and dryi ng food production line , a num ber of major proje cts impleme nted, handica p, li u li he reserv oir pr oject w ork smoothly, these projects originated from the "twelve-five"

9、 conti nue to a ccumulate, to devel op their pote ntial in t he "thirtee n-five" concentrated duri ng release. orie nt, is to deepen the understanding of a ccurate. after years of the revision, devel opme nt of jing chuan sta nd on a ne w hist orical starti ng point, features of economic a

10、 nd social devel opme nt has cha nged significa ntly. compre hensive constr ucti on of well -off society in e ntering t he showdow n to win stage, dual act ion and poor preci sion, drive n by county poverty dr opped from 37.5% to 11.2%. full implementation of the "1+17", "2+19" p

11、rogramme, ensure the timely realization of poverty, p oor people to a chi eve well-off soci ety, we must battle tasks. fr om the per spe ctive of curr ent income, poor village, the poor ge nerally la ck strong i ndustrial support, most rely on service reve nue , along with the dee pening of structur

12、areform, low skills, hard w ork will become incre asingly difficult, la bor income jump more a nd morex5j0sxa409aa01巧用等底等高的關(guān)系求圖形的面積孟桂民一、學(xué)問基礎(chǔ)在我們以前的學(xué)習(xí)中，我們把握了很多基本圖形的面積運(yùn)算方法，請(qǐng)同學(xué)們觀看，下圖中哪些圖形的面積相等？為什么？已知 l 1 / l 2 （單位：厘米）從圖中我們看出s abcs abds abes 平行四邊形 hgfis 平行四邊形fgjk由于 abc 和 abd 及 abe 等底等高所以它們的面積相等，同理平行四邊形hg

13、fi和平行四邊形fgjk 等底等高所以它們的面積也相等；而平行四邊形fghi 和三角形abc 等底等底，所以平行四邊形的面積是三角形面積的2 倍；從這個(gè)練習(xí)我們得到：假如兩個(gè)或幾個(gè)三角形底相等，高也相等， 那么這幾個(gè)三角形的面積也相等；下面仍有一組圖形請(qǐng)同學(xué)們觀看，下面幾個(gè)三角形面積之間有什么關(guān)系？為什么？（單位：厘米）從觀看我們看出圖1 的三角形面積和圖2 的三角形面積相等， 由于這兩個(gè)三角形等底alleviation crucial further development to a ccelerate the proce ss of well -off society ha s creat

14、ed a great opport unity. 18 si nce t he ce ntral and provi ncia l poverty all eviation a nd devel opment i nto the overall strategic planning, priority a nd "first proje ct" , formulated a series of poli cies now focus, development mea sures have all be en clear. we want to seize the oppor

15、t unit y, pre cisi on a ppli cation strategy, focus punch, break "support . , s upports t he devel opme nt of ol d revoluti onary a nd a series of poli cy measure s in areas such as i nfrastruct ure, publi c servi ces, promoti ng hig h standards, support, and more opportunities for us to a ccel

16、erate development, provide greater support. from provi nce s policy oriented see, "1236" poverty st orming, a nd "6873" traffic breakthr oug h, and "6363" water guara ntees, major a ction speed up implementatio n, e col ogical security barrier, and long ea st energy che

17、mical base constructi on, major strategy intensive introduced, and provincial "eig ht a change", and "eighta both" and munici pal "six a into", a nd "six big support" of de cisi on depl oyment, conce ntrated release has many poli cy good. in parti cular gansu

18、silk roa d economic belt of gold a nd heritage of chinese civili zation construction of adva nci ng the i nnovati on zone , jing chuan based a dvantage, create node cities a nd provi de a br oader spa ce in core area s. from i county proje ct resource s see, national e col ogical civilizati on pilot

19、 e ngineeri ng model county a nd cycle e conomi c mode l county tw o a national pr oje ct landing impl ementation, will i n country province level w on m ore support; pi ngliang to jingchua n city inter fast cha nnel, a nd xi ping railway double tra ck, major pr oje ct into provinces plate, will fur

20、t her upgrade i county traffic hub and channel economic stat us; paper brigade i ntegrated body, and zhu jia jian reserv oir, a nd agri cult ural pv power, and ga s utilizati on, and commodity trading and the agricult ural wholesa le market, and million tonnes of controlle d atmosphere fruit a nd fr

21、eezi ng and dryi ng food production line , a num ber of major proje cts impleme nted, handica p, li u li he reserv oir pr oject w ork smoothly, these projects originated from the "twelve-five" conti nue to a ccumulate, to devel op their pote ntial in t he "thirtee n-five" concent

22、rated duri ng release. orie nt, is to deepen the understanding of a ccurate. after years of the revision, devel opme nt of jing chuan sta nd on a ne w hist orical starti ng point, features of economic a nd social devel opme nt has cha nged significa ntly. compre hensive constr ucti on of well -off s

23、ociety in e ntering t he showdow n to win stage, dual act ion and poor preci sion, drive n by cou nty poverty dr opped from 37.5% to 11.2%. full implementation of the "1+17", "2+19" programme, ensure the timely realization of poverty, poor people to a chi eve well-off soci ety, w

24、e must battle tasks. fr om the per spe ctive of curr ent income, poor village, the poor ge nerally la ck strong i ndustrial support, most rely on service reve nue , along with the dee pening of structurareform, low skills, hard w ork will become incre asingly difficult, la bor income jump more a nd

25、more等高所以它們的面積相等；圖 3 的三角形面積是圖1 的三角形面積的2 倍，由于圖 3 的三角形和圖1 的三角形高相等， 圖 3 三角形的底是圖1 三角形底的2 倍，依據(jù)三角形面積運(yùn)算公式得到：圖 3 的三角形面積是圖1 三角形面積的2 倍；圖 4 的三角形面積也是圖1 三角形面積的2 倍，由于兩個(gè)三角形的底相等，圖 4 三角形的高是圖1 三角形高的2 倍，所以依據(jù)三角形面積的運(yùn)算公式得到，圖 4 的三角形面積是圖 1 三角形面積的2 倍，從這個(gè)練習(xí)我們又發(fā)覺：假如兩個(gè)三角形的底（或高）的長度相等，那么這兩個(gè)三角形高（或底）的比就是這兩個(gè)三角形面積的比；用上面這些關(guān)系我們可以解答一些較復(fù)

26、雜的求圖面積的題；二、方法例談學(xué)校有一塊三角形的植物園地，生動(dòng)小組同學(xué)想把這塊地等分成4 份，以便種植四種不同的花籽進(jìn)行試驗(yàn)，怎么分呢？于是他們請(qǐng)數(shù)學(xué)小組同學(xué)幫忙，下面是數(shù)學(xué)小組同學(xué)們提出的一些安排方案，請(qǐng)你們幫忙分析一下，他們的安排方案都正確嗎？把底邊bc 等邊四份，再分別和a 點(diǎn)連接成四個(gè)三角形，這種安排方案你認(rèn)為正確嗎？這種安排方案正確，由于把底邊bc 等分四份， 這時(shí)四個(gè)三角形故底相等，又都以a 點(diǎn)為頂點(diǎn)，所以它們的高也相等；由于底等高等，所以這四個(gè)三角形的面積相等；已知 d 是 bc 的中點(diǎn)， f 是 ab 的中點(diǎn) e 是 ac 的中點(diǎn)請(qǐng)你們自己分析一下，這種安排方案正確嗎？通過分析

27、我們得到：這種安排方案正確，由于d 是 bc 的中點(diǎn)，所以s abdsadc 又alleviation crucial further development to a ccelerate the proce ss of well -off society ha s created a great opport unity. 18 si nce t he ce ntral and provi ncia l poverty all eviation a nd devel opment i nto the overall strategic planning, priority a nd &quo

28、t;first proje ct" , formulated a series of poli cies now focus, development mea sures have all be en clear. we want to seize the opport unit y, pre cisi on a ppli cation strategy, focus punch, break "support . , s upports t he devel opme nt of ol d revoluti onary a nd a series of poli cy m

29、easure s in areas such as i nfrastruct ure, publi c servi ces, promoti ng hig h standards, support, and more opportunities for us to a ccelerate development, provide greater support. from provi nce s policy oriented see, "1236" poverty st orming, a nd "6873" traffic breakthr oug

30、h, and "6363" water guara ntees, major a ction speed up implementation, e col ogical security barrier, and long ea st energy chemical base constructi on, major strategy intensive introduced, and provi ncial "eig ht a change", and "eighta both" and munici pal "six a

31、 into", a nd "six big support" of de cisi on depl oyment, conce ntrated release has many poli cy good. in parti cular gansu silk roa d economic belt of gold a nd heritage of chinese civili zation construction of adva nci ng the i nnovati on zone , jing chuan based a dvantage, create n

32、ode cities a nd provi de a br oader spa ce in core area s. from i county proje ct resource s see, national e col ogical civilizati on pilot e ngineeri ng model county a nd cycle e conomi c mode l county tw o a national pr oje ct landing impl ementation, will i n country province level w on m ore sup

33、port; pi ngliang to jingchua n city inter fast cha nnel, a nd xi ping railway double tra ck, major pr oje ct into provinces plate, will furt her upgrade i county traffic hub and channel economic stat us; paper brigade i ntegrated body, and zhu jia jian reserv oir, a nd agri cult ural pv power, and g

34、a s utilizati on, and commodity trading and the agricult ural wholesa le market, and million tonnes of controlle d atmosphere fruit a nd freezi ng and dryi ng food production line , a num ber of major proje cts impleme nted, handica p, li u li he reserv oir pr oject w ork smoothly, these projects or

35、iginated from the "twelve-five" conti nue to a ccumulate, to devel op their pote ntial in t he "thirtee n-five" concentrated duri ng release. orie nt, is to deepen the understanding of a ccurate. after years of the revision, devel opme nt of jing chuan sta nd on a ne w hist orica

36、l starti ng point, features of economic a nd social devel opme nt has cha nged significa ntly. compre hensive constr ucti on of well -off society in e ntering t he showdow n to win stage, dual act ion and poor preci sion, drive n by county poverty dr opped from 37.5% to 11.2%. full implementation of

37、 the "1+17", "2+19" programme, ensure the timely realization of poverty, poor people to a chi eve well-off soci ety, we must battle tasks. fr om the per spe ctive of curr ent income, poor village, the poor ge nerally la ck strong i ndustrial support, most rely on service reve nue

38、 , along with the dee pening of structurareform, low skills, hard w ork will become incre asingly difficult, la bor income jump more a nd moref 是 ab 的中點(diǎn)s afdsbfde 是 ac 的中點(diǎn)s adesdec s afds bfds ades dec所以安排方案正確已知 d 是 bc 的中點(diǎn)， f 是 ab 的中點(diǎn)， e 是 ac 的中點(diǎn)，你認(rèn)為這種安排方案正確嗎？為什么？這種方案正確，由于ef 分別為 ac 、ab 的中點(diǎn)，所fe 肯定 /bc 并且 fe 的長度等于bc 長度的一半，而d 是 bc 的中點(diǎn)，所以bd=dc=fe又 fe/bc 且 f、e 為兩邊的中點(diǎn)，所以四個(gè)三角形的高相等；由于四個(gè)三角形的底相等，高也相等，所以它們的面積相等，下面仍有一些安排方案，你認(rèn)為它們都正確嗎？ d 為 bc 的中點(diǎn)； e 為 ad 的中點(diǎn) d 為 bc 的中點(diǎn)； e 為 dc 的中點(diǎn)； f 為 ad 的 中 點(diǎn)alleviation crucial further development to a ccelerate the proce ss of well -off society ha s created a gr