2024小学奥数精讲精练二年级含答案.pdf

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2、26 ffi+*fa,!i!,.00.27 M-iJrl f*1(Ji J1$tA*)27 M-i;1j f*2(Ji J1$tA*)28 M-i;1J f*3(Ji J1$tA*)29 ffi+-fh.:m fa jjj.30 M-i;rj f*1(Ji J1$tA*)30 M-iJrl f*2(Ji)!$tA*)31 M-iJrl f*3(Ji J1$tA*)32 m+-.,tt.J:i:.33 M-i;1J f*1(Ji J1$tA*)33 M-i;1J f*2(Ji J1$tA*)34 M-i;rj f*3(Ji J1$tA*)35 M-i;rj f*4(Ji J1$tA*)36 M-

3、iJrl f*5(Ji J1$tA*)3 7 M-i;rl t*6(Ji)1 iA*)38 M-iJrl f*7(Ji J1$tA*)39 M-iJrl t*8(Ji)1$tJJ_*)40 M-iJ1j f*9(Ji J1$tA*)41 ffi+=fa j)j.42 M-iJrl f*1(Ji J1$tA*)42 M-i;rj f*2(Ji J1$tA*)43 M-iJrl t*3(Ji J1$tA*)44 ffi+j *1,.45 M-iJrl f*1(Ji J1$tA*)45 M-i;1j f*2(Ji J1$tA*)46 M-iJ1l f*3(Ji Jt.$tA*)4 7 M-iJ1l

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5、A*)5 7 ffi+J.*ff i,t .58 M-iJrl f*1(Ji Jt.$fA*)58 M-iJrlf*2(Jilt.$fA*)59 M-iJ1l f*3(Ji Jt.$fA*)60 M-i;1J f*4(Ji Jt.$fA*)61 M-i;1J f*5(Ji Jt.$fA*)62-*-fa!ej)j.63 M-iJrl f*1(Ji Jt.$fA*)63 M-i;rl t*2(Ji t.iA*)64 M-iJrl f*3(Ji Jt.$fA*)65 ffi-+*15 fl1k J:t.66 M-i;1J t*1(Ji Jt.$fA*)66 M-i;1J*2(Ji Jt.$iA*)

6、6 7 M-iJrl f*3(Ji Jt.$fA*J 68 ffi-+-*te ffi fa 1l 69 M-iJrl f*1(Ji Jt.$fA*)69 M-i;rJ t*2(Ji&$fA*)70 m-+-llfaJ:iil.71 M-iJ1l f*1(Ji Jt.$fA*)71 M-iJ1l f*2(Ji Jt.$fA*)72 3 M-iJrl t*3(Jilt$R*)73 M-iJrlt*4(J1tlt$R*)74 ffi-+=l i fa Ji!jJj.7 5 M-iJrl t*1(Ji ft$R*)7 s M-iJrl t*2(Ji ft$R*)7 6 M-i;rj t*3(Ji f

7、t$R*)77 ffi-+12:9 1n fa,Bjij.7 8 M-i;rj t*1(Ji ft$R*)78 M-i;rj t*2(Ji ft$R*)79 M-i;rj t*3(Ji ft$R*)80#.=.81 4 M!aJA 1-11im,121-A m 121-tlim WITA15ffl 1-,A.121-Affi 12-A15ffl 1-rm,12 1-A m 12 ll*12+6+4 -22(1-)m 0 2 -3 -6(1-)*-4(1-)rmm-ff 0 1 K-4-1:35+1-36()-9()0 9-4(1tf)0-0 2 ftJ t 50 Y:50-44 -36+8-6

8、(1)0 44()3 :s:z:-2-3(1)22+22-34 -10(Jm*)0-0 l-35Jll*-+4 ftJ kk-:sz:-(1)fJI11tt%i!Xf1=BJ 39 A,1itt3EftBJ 36 A,WJ#ftt1Jtt%BJ 33 A,&AY%mtT-#f1=,-c l)f)Ij!:YA?o 00 Yr:l=f laJ!ff:if?J.*WJ_#ft t1Jtt%BJ A o iIQ.f,-C 1)fJIBJ.,AJJJt1Jtt%i!X ft 131 A EJ 11tt:M f1=BJAir*,WJ#ftt1itt%BJAo 39+36-33=42(A):-c 1)fJi

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26、5 3f t,;J_tJU 8 at,1J_tiUJL?2.*lEfo1JJJ(A11-f,*lE%117,1tBLffJJ!1JJEfJ 21-fo A(ABt)A 1 iliitff(ABtiU%,1JJ%11JL?3.;J71%$_t,ilifflf!J;itT-TBtfsJ,)A 2 0 4 fflT 40 f!J;o U*ittB 1*-1.iU s,:0i$Yf!J;?4.1JJA 1 IEPJU s 1ffi s?J.ift,1JJJlfPJ-mffJstrsJ1J ffJ-*,1JJJ JA 1 iU 4$YBtfsJ?20 19tl 0X$tt4ir%B?J#rtJAJ1Ir

27、tJ3f ili-!fjij$,$tt3f iliffi 10!fjij$Bt,-UTY?t#?ffii$t3filiffi 10!fjij$Bt,-UT 10-1=9()BtfaJfaJJWj;4iJWj 8?t#3fili-$jij$,ffr-UT 9X8=72(Jt#)0%F:-:ii T 72?t#o 1.03($1taJ 3 im0i$4ir%6 5t#(ttL5tili-m$,ffi 1 I$-&!6 stm3f ili,6 at 30?JBt3f ili BffiJL!fjij$?2.03($fl4iJWj 8 7J#(tr3fili-I$,ffi 1 I$tE 5 Bt 10

28、7J3fililJ,ffi 7 m$MittE1tBt1f*3f ili?3.1 J*B:iu,st#JLJ#tJtJL r,s J at s r,ffl st 14 fJ;,1l s J at s r,fflBtYfJ;?4.)($1fi:iifit=f=t,j1PJJ$ftji!;ltBt L5(tij OruJa o t!tj($_t,Pfr Llffi 1 JaOfPJiLlffi 5 Jaofuj,UT 16 f);o ffi 1 JaoruJJLlffi 9 JaofPJ:iiYfJ;?21-ftj oOOWrlR:JJ1:f 3 fAJB Ttnnfo 2 fAJB*J$,1fi

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31、E.ff+Mft XE.ft+t-fpff Mff+t-fpfto :-1=i 3#rAJBJZrfo 1.-=tsrt1Jtl11=i l:J3 6 pg T 4 A,Yfli,i*kA i:f=tZM A-=,-1=i y#rAJ BJZrl?2.7k*rn1=i s#JJ(*,?J.Jf*ffiT,fAA fiJf*,1Jlblbli*Jti:f=t BJM#,-1=i Y#rAJ BJZtl?3.f!T 1=i m EI,tI 4#IJ!sJt*T-,1Jf!ij kA i:f=t-IXWtB 3,-1=i y#rAJ sJ ey?4.1 J1=i 3*ffi-=ts:fFX !,2*

32、iil$45:t*i!1t 1:.iE),1Jz 2*ffi-=tstu 1*t1$-=t5,-1=iJL#rAJsJ11Wc7Jr!?23 19tl f:f3 G pg T (wu)5 A1Jo,&WAZfaJ1R-tX-=f,5 AJ,WYtX-=f?ffii f:f3 1-tg 4 A&AtR-tX-=f,tR 4 tX:f:f3+G f:f3+pg f:f3+T f:f3+;G1tg 3 A&AtR-tX-=f,tR 3 tX:G+pg G+T G+;pg1tg 2 A&A1R-tX-=f,W 2 tX:pg+T,pg+;TFo-AW-tX-=f,W 1 tX:T+o J,w:4+3+

33、2+1=10c tX):5 A,tR 10 tX-=fo m:EE _t13jtt:ttfi-aJ,&WAZfsJtR-X-=f,n AJtR-=f(n-1)+(n-2)+(n-3)+l(tl()o 1.-Jt,1*ft,ur 4 f?A,tiJE&pygf?AZrsJt-,ara a tl,1*Y?2.ffiJTAA3f,6 AJ m o*&WAJt1R-tl(-=f,Jj 1,tRY tl(-=f?3.o OOJYrlR:00 y to A B C D E F G 4.kAL#iJ:UffiffiE8-M,13j1 l 7G#jlI fliI 4 t,ti,MJLl$,-iliYAJE8$

34、?24 19tl f:f3 G pg 3 1il A*1-=r 3 m t w&MA z fa w-0 B o f:f3 w T 2 G WT 1 ,JJll:tBtWWT JL?ffii nI*fflITIDOOl!M?R:o o oo EJT=1cm Jg*f:f3 G w _=:11L A,ffl M Jg z rsJ tam*MAWM,AtaJLm*1-tBWMT JLo ffIWT 2 ,JJ f:f3 sJMJ;Jtf!JtJjUfO G WW sJ o A st iJl G fgtfLWT 1,Bt GJ?Jt7GfifoWta,mu GJ;lt WT 2,J:j*7Gt1o r

35、lf:tBtWrlWT 1 o :11:tBtWrlWT 1 o 1.f:f3 G W T 41ir(AJJtt1i frff tW,&M AZfsJW-o B o f:f3 G W 3 A?tJJIJWT 3 2 l a JJlf:BtTWT JL?2.f:f3 G W T DttW%J1ffW,&MAtW-,*f:f3 Jtt TW,EL f:f3 G WAnisJtmt(Ao G WJttT JL?Jt;jU JttTit?4.f:f3 G W T 4 A:itt1-r-iXfrf1W,&MAtW-,*ffl fliTT,Elffl G WAJttsJt(Ao TniT JL?25 19

36、tl ffl 2,3,4 1*,-i1.Y1&I*sJ11L?1E11Jt ili*o ffii i1.11LBt,RRJEsJJIW!ff,1iU7G:7GIo 2 lJX811LBt,JPYilirey 34,itey 43;3 lJXS 11LBt,JPYil11Ley 24,it ey 42;4 iN811LBt,JPYil11Ley 23,it ey 32;itJ)tiJt,f31i 3 fl,1f311Jffi 2 ff,r,3X2=6()ffo :E1fJ:234,243,324,342,423,4320 2.IITl1*,?tJJ1J o,s,6,90-t1.Y1rm:*stP

37、Yil11L?1E1fJt ili*o 26 11J-R1J1:E-ttrsJm,EOOJ:18*rjstx1Uio 1Atx13f Pft,ffi-i.xrPJJ:00 s*,xrPJrrt 4*;ffi=i.xWrPJJ:OO s*,rPJrrt 4*.*P001*,EJL i.xOOUtx1Ui?m;Jji.xrPJJ:00 5*,XrPJrit 4*,:tTiJCROO 1*,1EliiE-iJCOO_t U!FotJtfflrir*T,tl1tJti5l,iiE-iJCOO s*o,1fJ-aJ m 18*B9?1?tnx:$?t:jiJ:OOB-5*,-iJCOOJ:;roos 1

38、3*,-iJCOO 1*,Rritroo-fflOOJLiJCep-ar o(18-5)7(5-4)+1=14(i,X):1JOO 14 i.xOOiU?1Uio t.-R1J.!ROOJ:20 lm*rj B9tf Ui,E El 7C rPJ J:00 6 lm*,fJtJ:t)t?i r 4 Jm*o EJLXOOiUffU!?2.lrttf!1f-rJ#i#,1-*26*o-R;Jff;JBttrPJJ:00 6*,tir 2*o EOOiU#a ffly;JBt?3.*X-&!fliif*,1llirPJf!JJE 7 XfPJFoill 2 o 1filJEYi.xfi rPJ f

39、!JJE 52?4.-R!k4 kA#rPJJ:00,E El 7C rPJJ:00 s*,fJtJ:rPJrtt 2*o Effl T 6 X 00U#D,#i-*Y*?27 19tl 21 1g$1t*iU1uJxt Jm,1iiJ LQ-JJms,m-L 1 max,1 Jms&1JCii*s A,1fil1fJfffiY1JC;f:g:JU xfJ(:isfi-1)()?mi lJfffi B:!Guma,Hii*5 A,Yr,g,1 At:!Gul*,tILtJt iJl,1Jmfr-1JCxfJQJE 4 A;EBTiiJB-1JC!J6,JSl,J3/r s Ao firffi

40、s1 A$(21-5)-=-(5-1)=4(1JC),1Jo_tiiJB 1 1JC,j 5 1JCo :1fil1fJfffi 5 lf(;f:gJU xflo 1.41!g$lit*B:!Guaiu01m BJrliA)L$_tm,$)j_tQ-ii*6 As 1 Jmfr,t11fil1 fJfffiY1JC;f$iUrtA)t$(:isfi-1)()?2.37 1g$1t*iiriiJ,1iiJ LQ-ii 5 As1Jma,HmH-L max,1fil1 fJ fffiY1JC;ft$ii1iiJ(JSfi-1)()?3.1$1t*iiiiiJxtJWJm,1iiJLQ-ii*1 A

41、f81JmH-,Ha_t fllaX,1fil1fJ,g,jffiT 6 lf(;fifiiiuJ(JSfi-1)(),H&1JCim,IYA?4.-1ttmfll*UrtA)t$_t xJJlli,)JllQ-/Jmfr,ii*6 A,HmH-_t 1 mJJX,1fil1 fJ,jffl T 8 lf(;f$_t$(jsfj-JJ(),H&1JCim,1tt WJYA?28 19tl 32 1g$ll*IUruJxt Jm,1iiJ LQ-/Jfr,-L 1 ax,1Jfr&1JCii*7 A,L16r 2 A-Ll1f i*,1fil1fJfflY1JC:g iUxf J(JSliJJ:

42、1JC)?ffi;(l51fffi BLlfr,Rii*7 A,Hi16f 2 A-Llt lfil*,r kA1J-lf(xf Ji_tQ;E 5 A,EB TiiFo-1)(16JS lfil,r :iE 7 Ao fiJffiEfJA fffi:(32-7)-:-(7-2)=5(1)(),to_tiiFo-1)(,6 lf(o :1fil1f1fffi 6 lf(tiUxf J o 1.43!g$lit*BLlH-U-$AJL$_tm,$)J_tQ-iit*8 AEfJ7C g-,L16A 3 A-Ll1=fi*,131fil1fJfffiY1JC$UttA Jt$(JSliJJ:1)(

43、)?2.-tttWJll*BLlfriU$Jj_tEfj;J$WJm,)JllQ-ii*10 AsJ)C fr,L16 4 A Bt B!Plmfr1f i*,1fil 1fJ,ffl T 7 lf(:giiiuJ(JSli-11(),EL&1Xt,1ttWJy A?3.I$ll*iirAJ xtJWJm,rnJ _t-ii*4 AsJ1Jaiu-ii*8 AEfJ7Cfr,1Jfffi 1 ALl 7Cfrfffi 2 ALl a 1fil1fJtfrttlJffi*,1JH-1=f i T 41X*B-1-i T 6 1XtAtJEiiriiJ(JSliJJ:11(),EL&1JC t,I

44、y A?29-ftj 4.-R7C*220 rt-JJ(,-R1J*130 rt-JJ(,1tffl:1!1W-te 210.3t7j(m?J?30 19tl -EIXf,l 1l,21l 41lfO 81l1i!1lib-ffl IZ91i!1lib!i$ill$Y-?(RWftXf-a1lib)ffii*JA1J U JC sJ JJID!ff r-fFJU o-arill1islm=11lcm 11lsJ11!1lib),21lcm 21la1lib),31l(ffl l 1lfll 21l1i!1lib),41l(ffl 41lBJ1i!1lib)51l(ffl l 1lfll 41l

45、BJ1i!1lib)6 1lcm21lfo41lsJa11!b)71l(ffl11l 21lfo41lsJa1lib)s1lcms1ls1 11!1lib)91l(ffl l 1lfll 81l11!1lib),101l(ffl 21lfll 81ls111!1lib)ll 1l(ffl 1 1l,21lfO 81l1i!1lib)12 Jl(ffl 41lfll 81lBJ1i!1lib)13 Jl(ffl l 1l,41lfO 8 1l11!1lib)14 Jl(ffl 2 Jl 41lfll 81la1iib)15 Jl(ffl l 1l21l 4 JlfO 8 1lsJ11!1lib)

46、,151lBtll91i!1libfflT,-PfflT o :ill l 1l 1s 1l 1s ffl-sjo 1.1 1l 2 1l 41lfll 81lBJ11tiifb-,:k T-11tiifb,t)tXr!ill 5 1lfo 9 Jlsjf!lJ,:ks1Ja11!bJLJlsj?c R ifftXf-i1a1lib)2.r:f=trBtri fflXfr:f=trB,tlo*1-31 1lrB,!iY1t*JLa1lib?JL1ls1J?c R ifftXf sj-jfla11fb)3.-EJXffO 3 1i!1iib,%j3IJ l 1l 31lfo 6 JlBjo!i$

47、AJill$Y-?$Y1l?CRWftXf-a1lib)4.-EJXffO 3 a1lib,%jjIJ l 1l31lfO 9 JlBjo!i$AJill$Y-?$Y1l?CPWftXf-a1lib)31 19tl 1J 9 frft,1fili:J=tti-IX,IX tiE$-,1ElkA11r*_ttB*o .R-it XV,iiYf*JLIX,1*iiE1IX1ttB*?i.-T f*BJJfr!o m;7t1 9 fr?J.3)1,4TIn 3 0 ti:p BJIWJttUXVBJIW o*XV v,$BJ-8)t-IX;o*V1l,IXYlLlft1f*EJ 1 jti:J=t,

48、J!-IX8Jt1ttB TIXrfbiE 3 frfti:f=tT o Jt*IXBJ 3 fti:f=tBJ 2 ff UXVBJIW,-0 o*XVVJ,YlLlIXrfbft$BJ-;o*XVV ,YlUIXrfb8Jtf*BJl.1-o Yr.RIWIXPJJJ o :iiYf*IWIX,f*iiEfJreIXrfb:rtB*o 1.IJBJfN:Jn iuJxJutB*BJ 27 ti,1mi:J=tt1-ttIX,t fil 26 ti-,1ELkA1r*_t tB*o .R -it XV,iiYf*JL IX,1*iiE 1 IX rfb 1 tB*?i.-T f*B Jf t

49、!o 2.;J 18 ft,filOi:J=tti-IX,tfil 17$-,El kA1r*J:tB*o .R-itXV,iiYf*JLIX,1*iiEreIX1ttB*?i.-Tf*BJJfr!o 3.Jj.3:.45(T 36 t!lffli,fil i:f=t ti-t!lfEX BJ,frx 13 tBJ$,1ELkA1r*_ttB*o .R-it XV,iiYf*JLIX,f*iiEfjtftij:tttB*?i.-T*BJ Jf 1!0 32-ftj B*:r,tio:10 r IJIPjo)-JEE8JrID!ff?Jm,rir-1taJA 1 3f ft o 5 ftpPsJ

50、?tiF7f=10 1+9 2+8 3+7 4+6 5+5 4+6 3.t 11 1 A ff sJ *JJ 1 WIT 1 A ff sJ fat T ,JL ftp A E8 7f?ffl fO BJ%AlTili*o 4.t 13 1 A ff BJ Ii J 1 WIT 1 A ff BJ ,JL ftp A sJ 7f?ffl fQ sJ%:r 7Tili*o 33 11JaJA 1 fFr o 14=1+13=2+12=3+11=4+10=5+9=6+8(7+7 T 14,1EJ.1=f-1 7,r:f rJffl o):j1:f 6#:f(AjsJ1JOr!o 3.ft 21-4