初中数学分式化解求值解题技巧大全3

1、learn general se cretary on "two to lear n a" strengthe ning "four consci ousnesses" important speech ca use d a strong reacti on i n the country. me, watching "red treasure", the origin of buil ding the party ba ck to powe r, how to stre ngthe n servi ces for the masse

2、s, im prove party cohesion, fi ghting to become t he grass -roots party member s and masses hot topic. grass -roots party orga nizations "two" is to strengthe n the service of party members a nd cadres, the pioneer spirit. distri buti on of grass-roots party organizati ons i n all walks of

3、 pe ople, clot hing, shelte r, which bel ongs t o the nerve endi ngs of the party orga nization and comments reputation has a direct perce ption of the masses. strengthen the party ahead of the "pedal" spirit; strengthe n the party members and ca dres "succe ss does not hav e to be me

4、" and "the first to be ar hardshi ps, the last to" servi ce spirit to set the party's positive image among the pe ople i s importa nt. grass-r oots party organizati ons "tw o" is to clea nse all pe ople not happy not to see "stereoty pes", esta blish t he hone

5、st faithful, dilige nt faith for the people. no need to av oid me ntioni ng that, some members of our party can not stand the "money," corrosion of temptation, t hin, xu z hou, such a buse and corrupt briber y, malfeasa nce borers, a nd rats. tw o, is to clea n up, thin, xu, z hou's so

6、luti on to rest ore the party's fresh and nat ural, solid a nd hone st work style. cleansing "take, eat, car d," undesira ble and behavi our, "cross, har d and col d, push" attitude. gra ss-r oots party organizati ons "two" is to strengt hen t he se nse of ordinary

7、party members, partici pating in consciousne ss, unity consci ousness. for reasons k now n, member s of grass-r oots party branche s less m obile , less resour ces, a nd t he construction of party organizati ons have some lag. two studi es, is to focus on the grass-roots party bra nches "loose,

8、 soft, loose" problem, a dvance the party members and ca dres, "a gang worki ng", "hong kong report." strong cleanup acti ons, style and rambling , presumptuous "unqualified" party members, pays special attention to party members and cadre s "joini ng party of

9、 thoug ht" probl em. "party buil ding" is obtai ned in t he long-term development of our party's histori cal experie nce accumulate d. two i s our party under the new histori cal conditions, stre ngthe nthe party's constructi on of a new "rectification moveme nt." gr

10、ass-roots party organizations shoul d always catch t he har d work, results -orie nted. two educational outcomes are long-term ori ented a nd become an important impet us for the w ork. "two" shoul d have t hree kinds of consci ousness "two" study a nd educati on, basi c learni n

11、g lies i n the doing. only t he constit ution addre ss the series of party rules, a nd do solid w ork, be qua lified party members had a soli d ide ologi cal ba sis. only the "lear ning" and "do" real unity, to form a "learn -lear n-do-do" the virtuous cycle, a nd ultim

12、ately achieve the fundame ntal objective of education. thi s require s that the organizati on化简求值常用技巧在给定的条件下求分式的值，大多数条件下难以直接代入求值，它必需依据题目本身的特点，将已知条件或所求分式适当变形，然后奇妙求解.常用的变形方法大致有以下几种：1、 应用分式的基本性质例 1假如 x12 ，就x的值是多少 .2xx4x21解：由 x原式 =.0 ，将待求分式的分子、分母同时除以11112.x2 ，得2、倒数法x211x2 x121x213例2假如 x12 ，就x的值是多少 .2xx4

13、x21解：将待求分式取倒数，得x4x21x221xx21x1 2x12213原式 = 1 .33、平方法例3已知 x12 ，就 x2 x12 的值是多少？x解：两边同时平方，得x221x24,x21x2422.4、设参数法例4已知abc2350 ，求分式aba 22bc 2b 23ac 3c2的值 .解：设abck ，就235a2 k,b3k, c5k .2k3k原式 =2 3k5k3 2k5k6k 26.2k 223k 235k 253k 253例5已知abc , 求 abc 的值 .bca解：设 abck ，就 bcaabk, bck , cak.abc cakbkkckkkck 3 ，l

14、earning e ducation, ne ed thre e kinds of consci ousness: one i s to esta blish an i ntegrated awareness. " learni ng" and " do" what car istw o-wheel , bird wings, nee d to go ha nd i n ha nd, one end ca n be negle cted. communist the oreticia n and man. only by cl osely com bin

15、i ng the ory and pra ctice toget her in or der to truly reali ze their val ue. "learni ng" is the foundation, the foundati on is not st ong, shaki ng; " "is the key to net to net thousands of a ccount s. "two" education, "" lay the ba sis, going to "do&qu

16、ot; the key grip, so t hat the "lear ning" and "doi ng" ba ck to sta ndard, so t hat the majori ty of party members "learn" lear ning theory of nutrie nts, in t he "doing" pra ctice party's purposes. second, to esta blish a se nse of de pth. "le arnin

17、g" a nd "do" not chu draw n, entirely different, but the organic unity of the w hole. "tw o" learni ng education, we nee d to expl ore integrating "lear ning " in "do", exhi bit "do" in "science". to avoi d the "learning" int

18、o simple r oom instructi on, " do" into a monotone for doing.should expl oration "lear n" in the has " do", "do" i n the has "learn" of education and pra ctice of carrier, make s general grass-r oots members ca n in"learn" in the ha s "

19、;do" of a chieveme nts se nse, i n "do" i n the has "learn" of get se nse, real makes party of the ory brai n into heart, put for pe ople service concept outside of yu shape d. t hird, to a dhere to l ong-term t he awareness. style construction on the roa d forever, "tw

20、 o" had to catch the long-term. "two" study and educati on, by no mea ns, a ssa ult-style wi nd-sport, but the re curre nt educati on wit hin the party. in re cent year s, the party's mass li ne educati on practice and "three-t hree" special e ducation in grass-roots bor

21、ne rich fruits, vast numbersof party members a nd cadres wit hstood the baptism of the spirit. "tw o" greater need t o focus on longer hold l ong-term, t o establi sh and perfect the effective me cha nism of the e ducation, focusi ng on t he creati on of long -term education, strive to mak

22、e the vast number of party members to maintain their va nguard col or, mai ntain the party's advanced nature a nd purit y. awareness -raisi ng, ante nna s and atmosphere a discussion on how leadi ng ca dres of party members "two" current, "two" activity is in full swing up an

23、d down t he country, party cadre s as a "key minority" is both a barometer a nd impet us. the "two" meaning e nough deep, is to determine the party cadre s can resolve t o study hard first. in the "two" in the pro cess, some cadres of himself, standing long, hig h aware

24、 ness, that constituti on party rules is simple, its not w orth botheri ng some party cadre s think speak series has nothi ng to do with t he grass -roots work, water business learni ng serie s of spe eches se en as w indow dre ssing. these "lazy, casual, and de cadent" ideas le arning la

25、cks motivati on, a serious impe diment to "two" effect. john stuart mill once sai d, only a basic eleme nt of huma n thought patter ns change drama tically, human destiny can make great improveme nt. the same, only party members a ndlearn general se cretary on "two to lear n a" s

26、trengthe ning "four consciousne sses" important speech ca use d a strong reacti on i n the country. me, watching "red treasure", the origin of buil ding the party ba ck to powe r, how to stre ngthe n servi ces for the masses, im prove party cohesion, fi ghting to become t he gras

27、s -roots party member s and masses hot topic. grass -roots party orga nizations "two" is to strengthe n the service of party members a nd cadres, the pioneer spirit. distri buti on of grass-roots party organizati ons i n all walks of pe ople, clot hing, shelte r, which bel ongs t o the ner

28、ve endi ngs of the party orga nization and comments reputation has a direct perce ption of the masses. strengthen the party ahead of the "pedal" spirit; strengthe n the party members and ca dres "succe ss does not hav e to be me" an d "the first to be ar hardshi ps, the last

29、 to" servi ce spirit to set the party's positive image among the pe ople i s importa nt. grass-r oots party organizati ons "tw o" is to clea nse all pe ople not happy not to see "stereoty pes", esta blish t he hone st faithful, dilige nt faith for the people. no need to

30、av oid me ntioni ng that, some members of our party can not stand the "money," corrosion of temptation, t hin, xu z hou, such a buse and corrupt briber y, malfeasa nce borers, a nd rats. tw o, is to clea n up, thin, xu, z hou's soluti on to rest ore the party's fresh and nat ural,

31、solid a nd hone st work style. cleansing "take, eat, car d," undesira ble and behavi our, "cross, har d and col d, push" attitude. gra ss-r oots party organizati ons "two" is to strengt hen t he se nse of ordinary party members, partici pating in consciousne ss, unity c

32、 onsci ousness. for reasons k now n, member s of grass-r oots party branche s less m obile , less resour ces, a nd t he construction of party organizati ons have some lag. two studi es, is to focus on the grass-roots party bra nches "loose, soft, loose" problem, a dvance the party members

33、and ca dres, "a gang worki ng", "hong kong report." strong cleanup acti ons, style and rambling , presumptuous "unqualified" party members, pays special attention to party members and cadre s "joini ng party of thoug ht" probl em. "party buil ding" i

34、s obtai ned in t he long-term development of our party's histori cal experie nce accumulate d. two i s our party under the new histori cal conditions, stre ngthe nthe party's constructi on of a new "rectification moveme nt." grass -roots party organizations shoul d always catch t h

35、e har d work, results -orie nted. two educational outcomes are long-term ori ented a nd become an important impet us for the w ork. "two" shoul d have t hree kinds of consci ousness "two" study a nd ed ucati on, basi c learni ng lies i n the doing. only t he constit ution addre s

36、s the series of party rules, a nd do solid w ork, be qua lified party members had a soli d ide ologi cal ba sis. only the "lear ning" and "do" real unity, to form a "learn-lear n-do-do" the virtuous cycle, a nd ultimately achieve the fundame ntal objective of education.

37、 thi s require s that the organizati on k31, k1 abc原式 =abc1. abc5、整体代换法例6已知 113, 求 2 x3xy2 y 的值 .xyx2 xyy解：将已知变形，得yx3xy, 即 xy3 xy原式 = 2 xy3xy23xy3xy3 xy3. xy2 xy3xy2 xy5 xy5例：例 5.已知 ab0 ，且满意 a 22abba2a3b 3b2 ，求13ab的值；解：由于 a 22abba2b21 a 2abb 2 所以 ab 2ab2013aba 2abb 2所以 ab2ab103abab 213a b所以 ab2 或 ab

38、1由 ab0故有 ab133223ab123ab13ab 1所以 ababaabb 13ab13ab13ab3ab11评注：此题应先对已知条件a 22abba2b2 进行变换和因式分解，并由ab0 确定出ab1，然后对所给代数式利用立方和公式化简，从而问题迎刃而解；6、消元代换法例7已知abc1, 就abc.解：abc1, caba11 ,abbcb11acc1原式 =abababa1b abb1a111ababearning educati on, nee d three kinds of consci ousness: one is t o establi sh an integrated

39、 aware ness. "learni ng" and "do" what car i stwo-wheel, bir d wing s, nee d to go hand in hand, one end ca n be neglecte d. communi st theoreti cian a nd ma n. only by cl osely combini ng theory a nd practice togethe r in order to tr uly realize the ir value. "le arni ng&qu

40、ot; is the foundati on, t he foundati on i s not str ong, shaki ng; " "is the key to net to net thousa nds of accounts. "two" education, "" lay the basi s, goi ng to "do" the key grip, so that t he "learni ng" and "doing" ba ck to standard,

41、 so that t he majority of party members "learn" learni ng the ory of nutrie nts, i n the "doing" practi ce party's pur poses. se cond, to e stablish a se nse of dept h. "lear ning" and "do" not chu drawn, entirely different, but theorgani c unity of the wh

42、ole. "two" lear ning educati on, we nee d to expl ore integrating "lear ning" in "do", exhibit "do" in "scie nce". to avoi d the "learni ng" into sim ple room i nstruction, "do" int o a monotone f or doi ng. should ex ploration "learn" in the has "do", "do" in the has "learn" of education and practi ce of carrie r, makes general grass-r oots members ca n in "learn" in the ha s "do" of achievements sense, in "do" in the has "lea