人教A版选修2-3(精校版)

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15ᐗḄᔠᦪᓽC",#b.ᙠ⌕'‘"''ᒕ”!“##$%”Ḅ&'()•+7|,-,7__________2_____________________cm_(஻#m)!["—(஻#8)]!8(஻#8):_'஻;)জ=>(7஺=]AঝCᱯECFGH᪗JK᪗LMH᪗AঞCA=c;=x=yᡈx+y=஻2.ᔠᦪḄឋR2Qrn=Qin+z--m-l.#SᙢQa...஻+1UJᐗᐗḄᔠᦪ!aVᔠWXᑖZF[#[\ᨵᐗa,#[U\ᨵa.\ᨵaḄᔠ!aaa஻ᐗ^-1ᐗ“ᡂḄᐳᨵb…AU\ᨵ஺Ḅᔠ!aa...&u஻ᐗᐗᡂḄᐳᨵb.᪷eᑖ["2,"3»n+\JfᦪgᳮWXiᑮᔠᦪḄk#ឋR.ᙠ⌕ᱯlᑮ#SḄmn&'“\U\ᐸᐗ”Ḅᑖ[&'.().ii-i஻:஻:஻:(஻#m+1)+ᑴ஻2C+C..=---------4--------------------=--------------------n"?!(஻-“):(zn-l)![«-(/n-l)]!ml(n-m4-1)!(/?-TH+1+m)nl(஻+l)!=C[8:(஻#஻2+l)!|:(஻#஻z+l)!.■ᔆ/Wᔆr/n+.L஻+l"3.⚪᪆1•(1)f஺3+஺4+A(2)C"—C஻+2cA-1+C஻-2(1)gC=cA+cA+C=CA+CA=CA)=C)=210A()(2)G=©+☜)+(+)=5+=%=G.2.(1)0+1-C2*-3A(2)1.53-VI3Cx~24Cx~3_—43

16(1)ᵫgix+l=2x-3ᡈx+l+2x-3=13♦x=4ᡈx=5,ᵫ1KX+1K13i2WxW8xeN'•.•gḄZx=4ᡈx=5

171ஹÞ#ßàáᔠஹᔠᦪḄᭆãäᐸឋR;2ஹæçè#Vᔠ%ᵨê⚪ᦟÐëEè#Vᔠ%ᵨê⚪ᦟС#ஹìÑíᐭ1•ᔠḄᭆã#Sᙢ஻UJᐗᐗîᡂ#ïð஻UJᐗmᐗḄ#ᔠ•;)পUJᐗA(2)“ñU᣸”##óôឋAবõJᔠᐗõJ2.ᔠᦪḄᭆã஻UJᐗᐗḄᡠᨵᔠḄᦪïð஻UJᐗ8ᐗḄᔠᦪ.ᵨ÷øC"⊤ú.•••f3.ᔠᦪûC:ᳮ=஻(஻-1)("-2)(஻-஻+1)ᡈ38(71,mGN",5/n

18*3.Lᨵ8N☘Pᐸᨵ5NRSTUVWXYZCᨵ4N☘PRST[VWXYZ(ᐸᨵ1N☘P\⚗YZ^RST)Lᙠ⌕+ᢧ⌱5N☘Pcd;⚗Teᐸ3N+fUVWXYZ2N+f[VWXYZᑣᨵ#Ḅ⌱<=ᡃhiGᑖ,?@=জk\⚗YZ^RdTḄ☘P+fUVWXYZᨵC"=Cঝk\⚗YZ^RdTḄ☘P+f[VWXYZᨵCঞk\⚗YZ^RdTḄ☘P#+fToYZᨵ,...-;ᐳᨵq2c2+q3q1+q3c2—42s.*4.ᵬஹvஹw?xyᕜ+ᕜ;ᕜ{xy\ᜩ}ᵬ#yᕜ;v#yᕜ{)iG᣸2#Ḅyᕜ⊤<;=(᣸◀)-=42.<=ᑖ,\@=;@,ᵬ#yᕜ;#yᕜ{ᨵ;@,ᵬ#yᕜ;}yᕜ{ᨵ...;ᐳᨵC=C=+C=CC=42s.*5.6#Ḅᐰ〈5xx1ᨵ#Ḅ〈s<=;=+6#ḄT12“ᣊ”ᙠ;ᡂ;ᐗᨵsC=5“#ᐗ()”ᑖ5xᨵᵨs.᪷ᑖᦪᳮ;ᐳᨵ4=1800s.*6.+6#ᝅT14(1)ាᨵ1¡Ḅ1¢(2)£ᨵ1¡Ḅ1¢(3)ᨵ1¡Ḅ1¢¤ᚪ¦=⁚¤¨©ª«ᔠᦪḄᵨ¤ᚪZ®=

19¤¯°±:1.3.1⚗³´ᳮ(\¤µ)ᦟ¨·᪗=1ஹRᵨᦪᳮ¹º⚗³´ᳮC2ஹ»¼⚗³´ᳮ½⚗³¾¿³ḄÀ⚗Á³ᦟ¨ÂÃ=»¼⚗³´ᳮ½⚗³¾¿³ḄÀ⚗Á³ᦟ¨ÄÅ;ஹÆ©Çᐭ=প(a+Ë2=/+2"+஻=C*+cab+Cb2Cফ(a+b)3=a3+3a2b+3ab2+"=Cfa3+C1a2b+C-ab2+C>3*ব(«+Z7)4=(a+/?)(a+/j)(a+8)(a+Z7)Ḅᔜ⚗^Ø4Ù³ᓽ¾¿³ᨵÛ☢ݳḄᔜ⚗=a4,a3b,a2b2,ab3b4,¾¿³ᔜ⚗ḄÞᦪ=ß☢4à^#1஺Ḅâãᨵ1ᓽä/ḄÞᦪ¢ECាᨵ11åḄâãᨵC=ḄÞᦪ¢c=,ាᨵ21bḄâãᨵC=ᔠᱏḄÞᦪ¢ាᨵ31xḄâãᨵE,èḄÞᦪ¢éᨵ4^1xḄâãᨵC=/ḄÞᦪ¢C=,(a+b)4=C^a4++Ca2b2+C^b+C>4-ஹê<ë¤=1ஹ⚗³´ᳮ=(a+by=C°a"+C'a"b++Caf++C»"(஻GN*)n

202ஹ⚗³´ᳮḄ¹º=(a+b)”¢n(a+b)ï(a+b)ᙠïµᨵ\⌱ð⌱aᡈb,ᵫᑖᦪᳮiò¾¿³ᐳᨵ⚗(ᒹà@⚗)ᐸ;⚗^¢ateḄݳk=0,1,n;¡ô;⚗akb"",õ¢ᵫk(a+b)⌱ªa,n-k(a+b)⌱ªb5ᑮḄõ2LḄÙᦪöô+n(a+b)1kaḄ«ᔠᦪõhᔠ÷@⚗ø5⚗¾¿³6ø¢⚗³´ᳮ஺3ஹõᨵ“+1⚗ᔜ⚗ḄÞᦪC=0=O,1,஻)ù⚗³Þᦪ4ஹ£“;sù⚗¾¿³ḄÀ⚗ᵨᓾ⊤üᓽÀ⚗5ஹ⚗³´ᳮýa=l,b=x,ᑣ(l+x)"=l+C%++C>r++x"?ஹ*⚪ÿ᪆
1.(1+%.X(1+-)4=1+^(-)+0(-)2+^(-)3+(-)4=1+-+4+4+^-XXXXXxx~XX(1+-)4=d)4(X+1)4=(l)4r/+஺3+C\x2+C>+1]XXXL.4641=1+-+—+—+—•
2.(26)6.(2ᓝ)6=5(2x—1)6(2x)6-C(2x)5+C(2x)4-C(2x)3+C(2x)2-c(2x)+l]=64%3—192x?+24-Ox—160H------H—•XXX
3.(x+a)nḄḄ᎔ᦪ4⚗.(x+a)nḄᐳ13⚗Ḅ᎔ᦪ4⚗10⚗Qi=9a9==220/஺9.

21
4.(1)(2a+3b)6,(2)(3b+2aḄḄ3⚗.(1)+1=C(2a)4(3b)2=2160aW,ফ"=C(3b)4(2a>=4860#.$%(2a+3&6,(3H2a)6Ḅ'()*+,Ḅ/•⚗/*+.
5.(1)0+%)9Ḅ2ᦪ⚗(2)3+4)9ḄḄ56⚗.7=CG)9"(/)r=CAᨌ;,3yJXA(1)=9-^஻=஺/=6?2ᦪ⚗ᓽ2ᦪ⚗A(=B3=2268(2)3+C)9Ḅᐳ10⚗’Ḅ56⚗ᑖF5⚗ஹ6⚗’7Me1"H"J*,7=B.32L”=37877.XNᚪP(Q⁚NSTU⚗VᳮX⚗ḄY⚗ZNᚪ[\N']^1.3.2ᩰ`4a(6bN?)ᦟSd᪗:ᳮghi⚗jᦪḄឋlmnoᓫḄqᵨ

22ᦟSs$ᳮghi⚗jᦪḄឋlmnoᓫḄqᵨᦟStuஹvTwᐭ1.⚗Vᳮ(«+b)n=Ca"+C'a"b++Cran-rbr++Cbn(nsN*)nn2.⚗ḄY⚗ZT=Can-rbrr+[nஹyzN1.⚗jᦪ⊤(ᩰ`4a)Q(a+}"Ḅ⚗jᦪ=஻~1,2,3…?⚗jᦪ⊤⊤61,◀1"᜜Ḅbᦪ6bᦪḄg•2.⚗jᦪḄឋl(1)ឋ.}✌6”Ḅ6b⚗jᦪ*(•••c=cr).(2)ឋ}ᨬᜧ.•••=஻(஻7(~2)(i+1)=.1,k\k•••c*CᔆḄᵫᓃP£VHு10%¨©KK2=ª¨©?⚗jᦪ⌲¬ᜧ.ᵫឋḄ'®¯ᑖ⌲¬PḄ°2ᙠ5²ᨬᜧfin-\஻+1=஻Ꮤᦪ?5⚗G²ᨬᜧ=஻᜻ᦪ?56⚗C3,ᵬ²ᨬᜧ.(3)ᔜ⚗jᦪg7(l+x)n=1+C½++c£++¿Àx=],ᑣ2"=C஺+C1+C?++U++c"3ᐔÆÇᔠḄÉÇbᦪÊË)4ஹ
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23
1.ᙠ(a+b)”Ḅ᜻ᦪ⚗Ḅ⚗jᦪḄgᏔᦪ⚗Ḅ⚗jᦪḄg.ÊËᙠ(a+b)"=Ca"+Ca%++Caf++C»"(஻eN*)ÀÎI](l-l)n=C°-C+CY++(-1)"C,ᓽO=(C+C,+)-(C+C+),•••c+a+=C+C+,ᓽᙠ(a+Ï”Ḅ᜻ᦪ⚗Ḅ⚗jᦪḄgᏔᦪ⚗Ḅ⚗jᦪḄg.ÐËᵫឋl(3)X
1C+C+=C+C+=2"T.
2.Ñ(1-2x)7=஺()+4/+஺2Ò2++஺7/(1)4+/++%;(2)%+%+a+%(3)I%I+14I++1%|.(1)=x=l?(1-2x)7=(1-2)7=-1ÓÔA4+4+%++%9••4஺+஺]+Õ++%=—1,Ö|%=0ØÙ஺()=1,••Q]+Q,++%=—1—1=■""2(2)Àx=l,0()+6+஻2++%=-1জx——19(2Q_4+a?—%+%—஻5+஻6—%=3U(2)/14-37(X)(2)4>2(4+4-tz4-)=—1—379••q+஽3+05+%=——•5(3)ᵫq,a3M5,஺7ᙳAÝ%,“2,%஺8ᙳAÞ.,.ᵫ(2)জ+ঝ²2(4+4+4+4)=—1+37•—1+3••%+%+/+஻6=--------••|%|+|%|++|a71=%—4+—%+—%(%++%+஺6)G(஺[+/+஻5+%)=3
3.(l+x)+(l+x)2+…+(l+x)X'Ḅjᦪ•(i+x)+(i+x)2+..y+x)J.(3)L(L+Q'(x+i)u-(x+i)1-(1+X)X•••â/ãAäᑖÉḄZ,ᑣᡠjᦪAC3

244.ᙠ(x?+3x+2)5Ḅ,xḄjᦪ.V(x2+3x+2)5=(x+1)5(x+2)5.•.ᙠ(x+lT2ᦪ⚗A1,êxḄ⚗AC=5x,ᙠ(2+x)52ᦪ⚗A2Ò32,êXḄ⚗AC2x=80x,êXḄ⚗A1-(80x)4-5x(32)=240x,îxḄjᦪA240.5.Ñ(4-4ᔆḄ⚗}4⚗Ḅ⚗jᦪðñA143,X-Ḅ2ᦪ⚗.~⚪òC:C=14:3=3C=14C/.3n(n-l)(n-2)(n-3)/4!=4n(n-l)/2!=>n=10.010-5rõr+1⚗A2ᦪ⚗öL=Co(4ù=(-2)rC0xkXÀW=0nr=2,.,Ò*I=Co(-2)2=180.îᡠ2ᦪ⚗A180.ᚪQ⁚NSTU⚗jᦪḄឋlᚪ::2.1.1ᦣþÿ
ᦟ᪗:ᳮᨵ▲Ḅᦣ


25ᦟᳮᨵ▲Ḅᦣ
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