优惠问题--2024五年级奥数精讲精练含答案.pdf

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1、iJL:,l.l fa J!:M 1 JI!i;rf fl;1(l 11 R*)1 JI!iJ1I t*2(Ji 11 R*)2 JI!iJ1I t*3(Jilt R*)3 *fa J:m.4 JI!iJII t*1(Jj 11 R*).4 JI!iJ1I t*2(Ji 11 R*)s-:a:-q;1j,.6 JI!iJ1I t*1(Ji 11 R*)6 JI!iJ1I t*2(Ji 11 R*)7 JI!iJ1I t*3(Ji 11 R*)8 T I fa J:jjj i.!iz,M 9 JI!iJ1I t*1(Ji 11 R*)9 JI!i)II t*2(JJl1 R*).10 JI!iJ

2、1I t*3(1il1 R*)11 JI!iJ1I t*1(Ji 11 R*)JI!iJ1I t*2(1il1 R*)12 12 13 14 JI!iJ1I t*1(Ji 11 R*)14 JI!iJ1 I t*2(Ji 11 R*)1 s Jl!iJ1I t*3(1il1 R*)t.,1.,/.-.Illn i;n.7J,fT i:Ji:i JI!iJ1I t*1(Ji 11 R*)JI!iJ1 I t*2(1il1 R*)16 17 17 18 19 JI!iJII t*3(Jil1 R*)JI!iJ1I t*4(1il1 R*)20 21 1 优惠问题-2024五年级奥数精讲精练含答案

3、-iJ1l t*6(:xi lt$fA*)22 ffiJ.j f*faJ.a!Yi !k$ffi$23 -i;1j t*1(:xi lt$fA*)23 -iJ1l t*2(:xi lt$fA*)24 -iJ1l t*3(:xilt$fA*)25 -iJ1l t*4(:xi lt$fA*)26 -iJ1l t*5(:xilt$fA*)21 ffi 1L*T I f aJ:jjj !k$Um 2 8 -iJ1l t*1(:xi lt$fA*)28 -iJ1l t*2(:xi lt$fA*)29 -iJ1l t*3(:xi lt$fA*)30 ffi+j-3:JZ-ti),ffl 31 -iJ1l

4、t*1(:xilt$fA*)31#z -iJII f*2(Ji ft$fA*)32 -iJ1l t*3(:xi lt$fA*)33 -iJ1l t*4(:xilt$fA*)34 -iJ1l t*5(:xi lt$fA*)35 -iJ1l t*6(:xi lt$fA*)36 -iJ1l t*7(:xi lt$fA*)3 7 jlz_-1f1J JJfil-t11j-1;-8(-Ji m=$:rz,*).38/.Y J;J;Jj:t./.5(_-7,.A ffi+-j Xi:l.,f;fri2,.39 -iJ1l t*1(:xilt$fA*)39 -iJ1l t*2(:xi lt$fA*)40 -

5、iJ1l t*3(:xilt$fA*)41 -iJ1l t*4(:xilt$fA*)42 -iJ1l t*5(:xi lt$iA*)43 -iJ1l t*6(:xilt$iA*)44 ffi+-*1J il!J fa J!l.!1.!45 -iJ1l t*1(:xi lt$iA*)45 -iJ1l t*2(:xi lt$iA*)46 -iJlj f*3(Jilt$j)_*)4 7 ffi+=j raj 9Jf I 1 fa DJ 48*-iJljf*l(Jilt$jJJ_*).48 -iJ1l t*2(:xi lt$iA*)49 -iJ1l t*3(:xilt$fA*)50 2 ffi+Im$

6、M 15*f*f aJ 51 -iJlj t*1(Ji t jJ_*)51 -iJlj t*2(Ji t jJ_*)52 -iJlj t*3(Ji it jJ_*)53 -iJlj t*4(Ji t jJ_*)54 ffi+.li$rs 1J I ,r:3 I cJ 9!ss -iJlj t*1(Ji t jJ_*)55 -iJlj t*2(Ji it jJ_*)56 -iJlj t*3(Ji it jJ_*)5 7 ffi+/,$rajJJI faJ.fi-Dl 58 -iJlj t*1(Ji it jJ_*)58 -iJlj t*2(Ji t jJ_*)59 -iJlj t*3(Ji it

7、 jJ_*)60 -iJlj t*4(Ji t jJ_*)61 ffi+-t$M 15 f !*f aJ 62 -iJlj t*1(Ji t jJ_*)62 -iJlj t*2(Ji t jJ_*)63 ffi+J.$J.e:fa:f;jij.64 -iJlj t*1(Ji t jJ_*)64 -iJlj t*2(Ji t jJ_*)65 -iJlj t*3(Ji it jJ_*)66 ffi+n$=If,Im ih H ml,R 6 7 -iJlj t*1(Ji t jJ_*)6 7 -iJlj t*2(Ji it jJ_*)68 -iJlj t*3(Ji t jJ_*)69 -iJlj t

8、*4(Ji t jJ_*)70 -iJlj t*5(Jilt jJ_*).71 -iJlj t*6(Ji t jJ_*)72 -iJlj t*7(Ji t jJ_*)7 3 -iJlj t*8(Ji t jJ_*)7 4 -iJlj t*9(Ji t jJ_*)7 5 ffi-+$M 1J f,ml R f aJ HM 7 6 -iJlj t*1(Ji t jJ_*)7 6 -iJlj t*2(Ji t jJ_*)77 3 ffi-+-lii*111*lE1Jf*af*R 78 iJlj i*1(Jj t tJJ*)78 iJlj i*2(Jj t tJJ_*)79 iJlj i*3(Jj i

9、t tJJ*)80 iJlj i*4(Jj t fJJ_*)81 ffi-+-Ji*1f 1*lE 111*a im R 82 iJlj i*1(Jj t tJJ*)82 iJlj i*2(Jilt tJJ*).83 iJlj i*3(Jj t fJJ_*)84 iJlj i*4(Jj t tJJ_*)85 iJII i*5(Jj t tJJ_*)86 87 4 12+12 wt:12 -4xl-4X(4+1)0-0-1.5 ft-1 0 0 0 1 1 J tr oo i 45 sJ ftilftil tr oo ffi*,m:*&*#1-t:2 ft 8 fl o:1:,m tr it!i

10、 1B 0P1Jtmmz#J,&tr 5?t#,Fo 3?t#&?t#1n 1 ft 6 ft o a*1JtrT Jc 38%#lEY1 5?J.f#:3875=73 1+1 iJ-,A*1-r iJ-,3 11i:,r x 3;,/4:th rh*2;,/4:th-r.c.b=;w,1-1;-ffl 1;,/4:th pr,r=,1-1;-ffl 1,:0.1/J JR;t,;1./J,DI IUJc.7J-v-r v-A 7J-v-r/1 Flb-=r-x1;1.,7J-v-r H.J IU-=r-x111.,o rm1u-00BJ 38-3=35(?J.!rft)r-*J,1x2=14

11、 C%#):f 9:1Jtm,7x3=21 C%#)PJ9:1Jtmo(2+14)x2.8+(1+21)x(2.8-l.6)-71.2(ft)-1.1-t:!mltesJ-:i:filI&34 ft,ttrJSZgJMfaJ,&3,Fo 2&1ii 2 fto;J IK71 jjcfJtft s,*T 16-:i:filI,tr1,;!t1-t:T Yft?l 0 3.m*r1f1H.tmz#J,1$&:J:e 35 ft,a*3:te,Fo 2:te-ar 9:-*ifts11Jt moffim*fflm*ffifffflElJffi$25re,;!tffl 4.11fJm7-JP,&31

12、wJ,11,x%iff 1Jtm rJSz#J,x%iff&fr 4.8 iff,Fo 2 fr-ar 9:-*11tE111Jtm o 1:.*Ili T 29 frx%iff,2-JG 0 44-:-5=8(Jt)4()0 17x8+lxll+lx4-151(5G)-9()7J.7J 3;13 o 17x7+3xll-152(5G)-19(5G)0-2.?0 3 0 -14xsJt1fr-1688 5G,14 0 iJI(1 1.1571.575x(5+1)=12(1):1mi1iU 12-trmwttJfo 2.Jj*BBJir:672Xl8=54(9),g.tsJt:54x7=378(

13、jc)=*4tT 378jco 3.Jjsi.Rfffi*:87(3+l)x3=6(x)i4ij:xBJ1frf-*:16X678=12(JG)&x1!1r=16-12=4C jc):i*r*&x1!114 7Go 4.)t 33#Pfi!yffiq=tY-1 11 JF,J!gt iOTiik*Bt*Y#Ro YJk*BJ*:337(8+3)X8=24(Jf)11T:24X6=144(jc):1mJg.11T 144 5co iJl(2 1.)t 16 q=t$j;i_ 3 :1673=51 mA*1r1xl4TAbg /J /J,D I :fifL/I bf X 1/u,t.:,;.,o

14、1rrITffi BJ 16-1=15()q=t,5 7G*1Jt 10 PJ$1t 0(1+5)x34+10 x(34-2)=524(5G)r:r.:tt-tt;T-i=t:Ji/i 1:.t 524 J1j 0 2.2574=61 r+rA*1r 1 hx 1*-l.tTAbg.1-J;./J 5R/J,r)I 7TJ;L/I bT:.:.-1/u,.0 25Xl6.8-6Xl6.872=369.6(JG):(25-6)Xl6.8+6Xl6.872=369.6(jc):,g.tT 369.6 7Go 3.2573=81 2slnn 1,rJ!117G$to rmmr oo BJ 24 t

15、q=i,8 t 7G *1i ,ff 8X2=16(re)PJ$1Jto 87(8+1)X35+16X3572=595(JG)frfr r:r 1:r:P-a:Ei-tt;595-:Ji/i rfn:f:;r:1.t J-C 0 4.2974=7 l r+r A*1r 1 Ei r x l c TAb gJ.J;./J/J,01 J 1/lbfXIJu,t.:,;.o rmmTffiBJ 28 fr q=i,-*PJ$1t,_W.AbgJ.J;.1/I bfX.1/u,l!;.o i)I(3 1.:tlo*3 ill.5#a+-ill 1#R,Jg.,1frn 3x8+1 x3=27(jc):

16、tio*2 ill.5#a-i-13.+2 ill.3#a-ill.,Jg.,1fr Jg 2X8+2X5=26(jc):Y1t 26 7Go 2.4X4=16():tio*2 5-lf 7 fo 2 5-lfifJffl:900 x2+160 x2=2120(jc):tlO*1 5-lf 7 ,3 5-lf 3:900 xl+400 x3=2100(jc)=*flBJg.fflY 2100 5to 3.1688 7 99=1 7 5(jc)17X(99-70)+5=498(JG):*J!14xifffi11498 7Go 4.35x(3007100)=105(jc)300-105=195(jc)ggt it,5-lf 5t *300 5c 13)lJ ifb at,1mi.R1tT 195 5c,JfJU 105 5co 105-35=70(jc)1mW *105 jc BJ lJ iPn at,9 fffi 11 70 JG,JfJ U 35 7Go mgJtittt.flf*35 JG r2 iPn o 5-lf 5t Jtrli it*300+105+35=440(jc)!Jmifbo :$*1frffi 440 jcBJ!fm iPn 0