共用问题、年龄问题-2024二年级奥数精讲精练含答案.pdf

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2、fi+*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-iJrl

3、 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 f*4(

4、Jilt.$tA*)48 2 M-iJrl f*5(Ji Jt.$fA*)49 ffi+Ji.*J 6J M fa J m.so M-iJII f*1(Jilt.$fA*).50 M-iJrl f*2(Ji Jt.$tA*)51 M-iJrl f*3(Ji Jt.$tA*)52 M-i;rj f*4(Ji Jt.$tA*)53 ffi+/,*:;:it:fajij.54 M-i;rj f*1(Ji Jt.$fA*)54 M-i;rj f*2(Ji Jt.$fA*)55 ffi+-t:*ilt.56 M-i;rj f*1(Ji Jt.$fA*)56 M-i;rj f*2(Ji Jt.$tA*)5

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 7

6、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$R*)7 6 M-i;rj t*3(Ji ft$R*

7、)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(1)0

8、 44()3 :s:z:-2-3(1)iJllit 1.43fA-1r,301Am 3o1tlr;A?t-1fEBr,30 1 APZ 30-:-3=10(1)fftlr;nA?tPZ-Jll,30 APZ 30-:-5=6()Jll,-PZT 30+10+6=46()7.K*o :1fil1fJ-PZT 46 7.K*o 2.2 itYrli-PJ1it-siEt*4 itYftJ-iXPJ 3ir 4-=-2=2(sit)i*;4!g;J$-ar m-siEt*,121g 1 J$-iXPJ3ir 12-:-4=3(5tE)i*;3 1g in q=i -r-u 3ir-s-lEi*,15

9、 it in q=t -iXPJ m 15-:-3=5(5-lE)i*o-1it T 2+3+5=10(s-lE)i*o :4 itYfJJw 12 tg1J$,15 itinq=i-iXPJ1it 10 siti*o 3.1!g yr PZ 1 mi,7!g yr PZ 7 mi;3 it$PZ 1 mi,18 it$Pz 18-=-3=6()ffiJo s-lEYrplili:it*7+6=13()Tiao :s-lEYrplili:it 13 OOo 4.36!g fPJ$:?tnx:36-:-4=9(t.)ft$:9X2=18():ff:9X3=27():18 ftW,27 ffo i

10、Jllit 1 1.E84:35-28=7()81 Ih Ih sJ 4 r.J BJ:3 5-=-7=5(1tr):Ih Ih B14 t ITT 5 1-fi o 2.4 41-EJJ;Jffi:2+4=6()4 4JsJ1J1:8+4=12c)Jj$ITT4JJffiITT:12-:-6=2(1tr):1J$ITT4t1J NNBJ 21tf o 3.4Mf._H;Jt*ITT:15-:-3=5(ffi)4 llJ11Jift ITT:(15+1)-=-(3+1)=4(1-fi):4llllITT4 1Jift ITT 5 1-fi o 4.ITT 4 1 J t*ITT 4 1tr o

11、 4.:!*1*4ITT4:16-=-2=8()At:16-8=8()At&ITTITT o Jl:1 4-mJ,llll ITT 4 15 ,1*1*ITT 4 t 7 ;2 41rtJ,ll ll ITT 4 t 14 ,1*ITT 4 6 j7;3 4 wl,llll ITT 4 13 ,1*1*ITT 4 5;4 4-mJ,.11 ITT!if 12 ,1*1*ITT 4 t 4 0 12-:-4=3(1-S:)0 :4 4 1rtr,ll ll ITT 4 1*4 t sJ 3 1-fi 0 i)l(ij2 1.AlJ!tEEfJ!tf fu:33+31=64()tt 80 Y:80

12、-64=16():ii:16-:-2=8(4):it 8 41-s o 2.AfJ!1:EITT4fu:12+15=27()tt 41 Y:41-27=14():ii:14-:-2=7(4)7 4)-Jjf!Fj:12+7=19()7 4)-Jjjt:15+7=22():p,;gAlJ fJJ 41 Bt,1J,FY1 fJJ 1j?t33Ll 19 fJ 22 0 3.-=-:A:EJ11E8f0:40+38+11=89()tt 59$:89-59=30()1 Iill:30-:-3=10()=10 fili,1m1r1a9fto 59 o 4.IbIb:37-3=34();j!rf:34-

13、28=6()-=-:A:EJ11E191FfJ:37+34+6=77()tt 101 Y:1O1-77=24():ii:24-:-3=8(!if):8 Fo,1m1fJ EI9!if fo 101 o s.ll9 A fJ11:E aJ f o:77+50+47+21=195()tt 163$:195-163=32()1 ill:32-:-4=8(!if)8!rf fili 1 J,fxJLl:21-8=13 C):1m 1fJ E8!if to 163 at,1 J 13 o-u11m 1 1.40+40-10=70(*)=*9!JSFosJt*10 J11*0 2.J!I Yr:.-56)

14、*-)1 911*1(;-3811*)56-38+9=27(1*):Jj-*fJiK 27 ll*o 3.4 ttij-=fJJ:i!1 t&tl-=f,if 3 ts;IT*-=fffll*,M-=f tTM 1 ,Yr l 1affl 2 li*o 4X8-3X2=26()11*):J!tl-=f:E.mK 26 J1I*o 4.35+35+35-2X4=97(*)82-u11m2 1.18+20-30=8(A):p,;gf/2txtaJff 8 A o 2.21+17-9=29(A):=(1)3j)Iff 29 A o 3.Mftrittil:E8:16+28-32=12(A)fl iJ

15、t xBJ:16-12=4(A)RiJFxElJ:28-12=16(A):Tm#iltil:BJ1i 12).,RiI=xlJ1f 4).,fl i1tXBJ*-f 16 A o 4.&i,m;-ar-*X wt*JE8=184+251-384=51(A)Pw-ar-*E8=184-51=133(J.),R w11t:J.R7J(1J:251-51=200 CA)=&lw-ar-*x w1:J.R,JiJ*-f 51 A,P w i=iJ-*EJ1=f 133 A,fl wit 7J(EI91i2OO A o 1.9%:XJ($1391f:57-45=12(A)-&:xx EI91=f:12+

16、24=36(A):-&:xx$EIJ1f 36 A o 2.,R1Jo-=t53jIEJ91i:64-35=29(A)1Jo-=t5r!fJIElJ1f:29+12=41(A):JJ0-=f:51!31JilJ1f 41 A o 3.flTmEJ97f-j:29-17=12(A)TmEl11i:12+9=2l(A)JlT00t)tlJ1i:17-9=8(A):TfJta97f-j 21 A,RTfJta97f-j 12 A,RTooma91i 8 A o 4.fl 1J0R3E:iztiJ*-f:107-78=29().)1JDfilJEElJ1i:29+48=77(A),R1J01fzv-EIJ*-f:78-48=30(A):JJ0R3:E91f 77 A,R1J0filJE:iftE91f 29 A,R1JoRtzt-aJ*-f 30 A o