2024小学奥数精讲精练四年级含答案.pdf

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2、3 24 24 25 26 27 1 2024小学奥数精讲精练四年级含答案#z-iJJ)jil;5(Ji,OC$J/J*).28 ffi n M fcJIJi.29#z-iJII j*1(Ji ft$J/J*)29#z-iJlj j*2(Jilt$J/J*).30#z-iJII j*3(Jilt$J/J*).31#z-iJlj j*4(Jilt$J/J*).32#z-iJlj j*5(Jilt$J/J*).33 ffi/l$i fa m.34#z-i)I I j*1(Ji ft$J/J*)3 5#z-iJlj j*2(Ji ft$J/J*)36 ffi$,t-,D!lEfaJN:!f!.37#

3、z-iJ1ljll;l(JiJ,t$J/J*).37#z-iJII j*2(Ji ft$J/J*)38 ffiJ.tfjffifaJ:!JOO.39#z-iJlj j*1(Ji ft$J/J*)39#z-iJlj j*2(Ji ft$J/J*)40#z-i)lj j*3(Ji ft$J/J*)41 ffi n$fjJ m.fa ro.42#z-i)Jj j*1(Ji ft$J/J*)42#z-iJlj j*2(Ji ft$J/J*)43 ffi+9 5-!:.44#z-M-iJ1!j*1(Ji It$J/J*)44#z-iJII j*2(Jilt$J/J*).45 ffi+-$-;JIJ$fa

4、jjj.46#z-iJlj j*1(Jilt$J/J*).46#z-iJI ill;2(Ji,0C$fJ*)4 7#z-iJlj j*3(Jilt$J/J*).48#z-iJlj j*4(Ji ft$J/J*)49 m+=a f*.iaJHro&ialifdJ 50#z-i)Jj ill;1(Ji ft$W.*)50#z-iJlj j*2(Ji ft$W.*)51#z-iJII j*3(Ji ft$fJ*)52 2#z-iJlj ill;4(Jilt jJJ*)53 ffi+_$T f;E fa B,ffi I c Jcl iz,#J 54#z-iJII ill;1(Ji ft jJJ*)54

5、#z-iJlj ill;2(J ilt jJJ*).55 Jiu_-1flj jfi.;1,1-1:-3(.JB:ta=fJl,*).56/.Y/:r-J j:t:./)Z.-/)._ +m,i.I.-+C:;1 8-;I./.-5 l!-!I 1T f.:E.(aJ .,1,xz,/,JIJJ 7#z-iJlj ill;1(Ji ft jJJ*)5 7#z-iJII ill;2(Jilt jJJ*).58#z-iJII ill;3(Jilt jJJ*).59#z-iJlj ill;4(J ilt jJJ*).60#z-i)I I ill;5(Ji ft iJ*)61 ffi+E.$ff fa

6、J tfi jJK M 62#z-iJII ill;1(Jilt iJ*)62#z-iJlj ill;2(Jilt iJ*).63#z-iJlj ill;3(Jilt iJ*).64#z-iJlj ill;4(J ilt iJ*).65#z-iJlj ill;5(Ji ft iJ*)66 ffi+/,$V3-faJ:OO 67 -iJlj ill;1(Ji J.l$iJ*)6 7#z-i;lj ill;2(Ji ft iJ*)68 ffi+-t 1l V3.,fa J m.69#z-i)lj ill;1(Ji ft iJ*)69#z-iJlj ill;2(Jilt iJ*)70#z-iJlj

7、ill;3(Jilt iJ*)71#z-iJlj ill;4(Ji ft#_*)72 ffi+J.$,ofa:Yi.73#z-iJI ill;1(Ji,OC fJ*)73#z-iJl)iil;2(Jif.t$j!J*).74#z-iJlj ill;3(Ji ft iJ*)7 5#z-iJlj ill;4(Ji ft$fJ*)7 6#z-iJlj ill;5(Ji ft iJ*)77 ffi+A$foin faJ!:Yi 78#z-iJlj ill;1(Ji ft fJ*)7 8 3#z-i)lj fll;2(Jilt$jJJ*).79#z-iJlj fll;3(Jilt$jJJ*).80#z-

8、iJlj fll;4(Ji ft$jJJ*)81#z-iJII fll;5(Ji ft$jJJ*)82 =+.1l.1a fcJ w.83#z-i)I I fll;1(Ji ft$jJJ*)83#z-iJlj fll;2(Jilt$jJJ*).84#z-iJlj fll;3(Ji ft$jJJ*)85 ft.86 4-(20-9)+(200-8)+(2000-7)+(20000-6)+(200000-5)-(20+200+2000+20000+200000)-(9+8+7+6+5)-222220-35-222185 2+2+2+1+8+5-20 -1019 1 11J-350+(350+6)+

9、(350-2)+(350-4)+(350+2)+(350+10)-350X6+(6-2-4+2+10)2100+12-2112 2+1+1+2-6 1516-145-147-135-148-136-133,E!r1fllLV.8 sJ1JY?3.it:387+382+377+375+384+379+383,E!r1fll 121.18 sJY?1686+1683+1689+1681+1691+1685+1687+1678 1331+1341+1344+1355-1329-1337+1350,E!r1fll 121.123 sJ1Jfll5J.2 11J 2003+2002-2001-2000+

10、1999+1998-1997-1996+3+2-l 0-(2003+2002-2001-2000)+(1999+1998 1997-1996)+(3+2-1-0)-4x(200474)-2004-(86+84+82+80+78+76+74+72+2)-(79+77+75+73+71+1)(1+3+5+999+1001+1003)(2+4+6+998)(108+104+100+4)(98+94+90+2)1989+1988+1987-1986-1985-1984+1983+1982+1981-1980-1979-1978+9+8+7-6-5-4+3+2+1 3 f91J(1)25X32X63Xl

11、25(2)25X9X64Xl25 C 1)=(A-25X(4X8)X63Xl25-(25X4)X(8Xl25)X63-lOOxlOOOx63-6300000-25x9x(4x8x2)xl25-(25x4)x(9x2)x(8xl25)-lOOxl8xlOOO-1800000-(1)25x25x25x64(2)125x7xl28x50(1)5X6X7X8X250(2)25x75x32x50(1)6x8xl2x5x50 x250(2)25X36X9+125X64X8 500 x400 x250 x8x6x5x4 4 f91J(1)720Xl7 18 C 1)=(A-720 C 2)=(A-1860(

12、2)18Xl7-40Xl7 680 (540 -18)-1860 30 1860 540Xl8-62-(1)(1)(1)1140X32 5774 1440 180Xl5 140X70 3000 125 8 75X25 98989898x9999999971010101 -(2)(2)(2)11111111 5 7200 x52 1150 600Xl2 9600Xl20 24 23Xll 40 8 f91J(1)65X499+97Xl3(2)54X99+47X301 C 1)=(A-65X(500-1)+(100-3)Xl3-65x500-65+1300-39-32500+1300-104-33

13、696-54x(l00-1)+47x(300+1)-5400-54+14100+47-10100-7-19493-(1)798x25+8lxl25(2)1007X57+994X33(1)34X403-51Xl20(2)497X22-103X36(1)402X38-33X96(2)38X999-101X76 99xll2+198x211-203x77 6 f91J(1)13Xl2-26X4+39X7(2)9966X6+6678X 18 C 1)=(A-13Xl2-13X8+13X21 13X(12-8+21)325-3322xl8+6678xl8-(3322+6678)xl8-180000-(1

14、)37X25+49X75+44Xl25(2)56X57+112X49-224Xl2(1)77777+7777+777+77(2)8+88+888+8888+88888+888888(1)8888X7+1111X44-11100(2)99X22+88X33+77X44+66X55(7777+8888)-5-(888-777)x3+(2222xl2+3333x4)-18 7 11J(1)999X999+1999(2)76543X99999+12345X99999 C 1)=(A-999X999+999+1000-999X(999+1)+1000-999000+1000-1000000-(76543

15、+12345)x99999-88888X99999-88888x(lOOOOO-l)-8888800000-88888-8888711112-(1)37x37+2x63x37+63x63(2)56X56+34X34-2X56X34(1)20092009X2008-20082008X2009(2)13361336Xl338-13381338Xl336(1)12345Xl2321-12344Xl2321+12345X42000-12344X42001(2)2008X2006+2007X2115-2006X2116-2008X2005 8 11J(1)987+798+879(2)3456+4365+

16、5643+6534(1)lzs 7J 987-900+80+7,798-700+90+8,879 800+70+9 xttt:1:_m:900+100+800-(7+8+9)xl00,80+90+70-(7+8+9)xl0,7+8+9-(7+8+9)xl 0-(7+8+9)xl00+(7+8+9)xl0+(7+8+9)(7+8+9)x(l00+10+1)24Xlll-2664(2)lzs 1g 3456-3000+400+50+6,4365-4000+300+60+5,;1t Wg IP:EJ.J t8 iJD xt,tt:E,m:3000+4000+5000+6000-(3+4+5+6)x

17、1000,Ef 1.fr+-(3+4+5+6)xl000+(3+4+5+6)xl00+(3+4+5+6)xl0+(3+4+5+6)(3+4+5+6)x(l000+100+10+1)18Xllll 19998(1)1357+3571+5713+7135(2)2468+4682+6824+8246(1)23456+34562+45623+56234+62345(2)778899+788997+889977+899778+997788+977889 9 f91J 19971997+9971997+971997+71997+1997+997+97+7 19971997-10000000+9000000

18、+900000+70000+1000+900+90+7 9971997-9000000+900000+70000+1000+900+90+70 19971997+9971997-10000000+2x9000000+2x900000+2x70000+2xl000+2x 900+2x90+2x7 0-10000000+2x9000000+3x900000+4x70000+5xl000+6x900+7x90+8x7-10000000+18000000+2700000+280000+5000+5400+630+56-30991086-1234567+234567+34567+4567+567+67+

19、7 2334455+334455+34455+4455+455+55+5 987654+87654+7654+654+54+4 10 n n n 0 (1)-n-(-a 1)7d+l d-()(n-1)(2)S,i-0 na1+n(n-1)11 1,3,5,7,9 -2Xd -11J 7,13,19 -1+(25-l)X6-1.3Jtl 5,9 13,17 2.3J1J 7,15,23,31 =fil:ft 12 tk:5.0 12 JK3JU&3JU,fJJJ!a1=5,*JJJ!an=93,0&d=9-5=40 fiffi&3JU B1JJJ!0 an=a1+(,i-1)d,AJ1f n=

20、(a11-a1)-:-d+1,ffllrtAJ CJ*ili$j;JJJ!0 n=(93-5)-:-(9-5)+1=23 :I!JU 23 rJJ!o 1.JU 8,11,14,1 7,98,1 o 1$y rJJ!?2.JU 4,9,14,19,249,254$yrJJ!7 4.1 Jii-*-=t5,m 1 xii 12 Jr,m 2 xtffi 1 x$ii 4 Jr,Fo4ijxftITTT-x$ii 4 Jr,!iFo-xiiT 68 Jr o*451J Jtrf,ijT$:P:x?5.t.kf-trFtf-t-t?t,iit,2015 1 fa.s1FAJg 7540 Jfli,2

21、)=J jg 8810 mi,FofaJ t tITTT-fa.J$(i.F 1210#a,o*JKs11*l!,rfaJ s1 Fi!IU 30400*EL?13 19,j it:1+4+7+10+.+20080 _too eJ A-=r ey Jftf 1u 1,4,1,2008 JJJJtfo*fO o EJrJtaM1irafo 11+16+21+960 n=(96-11)75+1=18 S18=(11+96)Xl872=963 15 q it.:12+23+34+45+56+67+78+89-(1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9)0 x.m fJ1,1*A

22、i:iJ?t 3&jti,?J.J31Jit pey o JffiA=(12+89)X872-(1+2+3+4+8)-(2+3+4+9)=404-36-44=324 1.it.:(lx2x3x4XXll)7(1+2+3+4+11)0 2.it:1+2-3+4+5-6+7+8-9+97+98-990 3.it:(100+99Xl)+(99+99X2)+(98+99X3)+(2+99X99)+(1+99Xl00)0 4.ffisJ.Afl(JEtWr-1FJtlBJ:4+2,5+8,6+14,7+20,iliffi 100 -A o*it.Er:rf 100 -ABJ;,fOo 16 29 a11

23、=a1+(n-l)d,am=a1+(m-l)d,r an-am=(n-m)d0 EE tl 80-aJ jQ,a6-a4=12=(6-4)d,*1 d=60 r a8=a6+(8-6)x6=450 :Effi 8 r,m 450 3.1 124 fo 245 z fsJtmA 10,1tE-&35Llo:I!10 i:p,fi1J JL,lli:kJL?4.-ttt14,*Yr1i1fAffi 2 x,xtttfili-x$1JOIJEs14o o*Yr1i11ffi 8 x1JOIT 118,ffi 19 x1JOIT 261 o Jj*Yff111ffi 27 Jc1JOI T$J;?5.

24、J jt!JJ=f,Affi 2 Jcjff,7eittfilj-Jc$JE8fo Q*Jj ffi 13 JcT 93 f,ffi 21 JcT 141 f o JjffiJL1e1J T 249 f?17 f91J-*-=1=5 sJ ff W,hA 1-62,*-1 62 o I J mf:(1 *-=1=5 EJr 1=f ff W;JD*sJ Bt1 jtJJn*-=1=5*-1-s-Kt*itwr T tkre1mJrfi!h;JD*BJ fU 18580*i twrtf sJ s-KtJ:sJ 1i!?7$Y?*-=f:5EJT1=f ff EJj:1+2+3+62=(1+62)

25、X62-:-2=1953 JUhsJfo:1953-1858=95 f!l7Jtwijf-s-KtrY1W-i Jr,Elr 95 tM-i BJfQ(-h)o(95-1)-:-2=4 7,EJr IW-i Jrfil?J 4 7 fo 480 :*itwi1fsJs-KtJ:sJh 47 fo 480 1.-*-t5sJff,hA 1-188,*-f 188 o;Jftt5!*-=1=5Elr1=fW1JD*sJ st 11*,L5t rJn *-=t:5 i:t=r rsJ 1=f 2 s-lf *i twr tf T,2 s-K?JJ.J,J 1-t5 i:t=r sJ JqJ 1 fl

26、 K,L E-s-KBJhfU tfu-s-K$280 11mh1JD*fU 174520 lJtWfjf sJ 2 s-KJ:sJh?tJ.JU$Y?2.-*-t5sJh,hA 1-345,*-f 345 o 1J:(1*-=1=5Elr*-1hjo*BJ st 11*,L5t rJn i!*-t5 i:t=r rsJ 1=f ii 5 s-K li tWr tf T,tk 1 1m w h no*,tu 589700*itwrtfsJ 5 s-KtJ:sJkA$:tU$:t?3.-ff;JiWJAsJ,hA 1-456,*-1456 o 1 J mfft1*-=1=5Elr1=f jo*B

27、1Bt11*,jtJJn*-=1=5 fl rsJ*-1 ii 7 5tt*iffijf T,11mW1Jo*,fU 1017110*itWrtfsJ 7 s-KtJ:BJkA$YU$:t?18 19,J JLlmYr1iT-ifJEr1.JL1JMo o*A3.3,Y!U$2;O*A*4,Y!U Y 6 o 1=f$y1JM?yr*T$yfJ5r?A3.3 ,_mu$2,iJlO*lJtrJg,.y 2,IEM-A*3;Bt,o*A*4 ,g)ty 6+2=8()0 tl18Jti3l,A$*I,ifJErBJ Jg,.gty 8 ,JJA.8Jt 871=8(A),lJErJg,.718x

28、3+2=26()o ti:i!AloJR!,p:1-EttmifbJtaJ1it1.,1iY-,Y!Utfm1=f*LlC P);1i$-,Y!Utfm1=fJE(P)o roJma1*m1t=1*=c IEi+)7*Wc;1*=(-j(JEi-;jJEi)7 Tm3.Wc;1*=(7(-Jj)7fm*Wc;J-ey-*ffi-fO-ltWo 1.1f11JaI?&maJ7(,o*9 A-til.,YlU$35 A;O*14 A-iii.,Y!UY 20 Ao 1Jal?&maJ7(3.T$:Ptil.?Jg,1=f$y A?2.Yr1ill-*-tttlii!ii3c$45,o*33*,.m

29、u,u s jcij;o*40*,ff&:100 jcijo lii!iiJ$45*$:P5cij?.rYrff*T$yjc?3.ffiifxt71UT,9(I)f;IPJtitxf o o*Ati 4 tl,ffJU 12 tl;O*A ffi 8 fl,ffiIJc 4 tlo ll9(1)fJI1=f JL!g PJffitxf?-t1i$Ytlifxt?19 f91J iiif:T,5K9ilil-ffi?t%t*ml11JnJJo o*iij:A?t 4 31,YlUff*U 12 3l;o*iij:A)t6fl,JJlUffJU 2 flo*msJ1J M1=f$YA?:i!ffi

30、1=f$Y 31?&.0 1 JJfflsJA:(12-2)7(6-4)=5(A):i!ffisJfl:5x4+12=32()=*msJ1JJffl1=f 5 A,:i!ffi1=f 32 flo t.#t*_t,9rfJ%tfAJ1fJ?to o*iij:A?J s XJJlU$12 X;o*iij:A?J s X JJlU$3 Xo _t#t*sJfAJ1=f$YA?1=f$YX:?2.r ffl-tttW jJoIoc,o*1JDI 125,JJlU Y 46*;O*Y1JD I 20,ffY 6*o-ocffl$Y*Wt-l-?:i!ttt1f.Jt41=f$Y*?3.J L Im B

31、J I J M?Jif-=f,o*iij:1 J M?t 6 J3c,JJlU y 20 J3c;o*iij:1 J M?t 4 J3c,JJlUJxJLlf?t%o 1 JnJJ1=f$YA?iJf-=f 1=f$YJ3c?4.fAJ1 fJf_xlJm,o*iij:A 15 J3c,ffJUT 30 J3c;o*iij:A 18 J3c,ffJUr 12 JJco iij:A$:J;J3ciEM-ri%?20 19,j:kwJr!i:!U t!U 7f t1FffiB1 a*lfifsJ114 A YlLl 240 Ax)%11;a*lfifsJ118A,9!UtB 15 lsJffio

32、ttUswJr!i:$:PA?tB 15 rsJm,tr 15xs=12ocA)0 EB 1Jt=c?&+5)-;-JWJ(?Jwc&,-ar =msJrsJ=c 240+120)-:-C s-4)=90c raJ)wJrsJA:4x90+24o=6ooc A):tiUsfJr 600 Ao 1.1!r)L;Imm if:6l 4t !fi1T ti 10:6l,tt$5:6l;!Ji 1T m 15:6l,ff 1 1T O 1!r)L;4t lmtl$Y:6l4t?1*$Y1i?2.JLft-=ffx,:WIAJLlfr,D*lfiB-*4 A,YlLl$1 A;D*lfiB-*5 J,Y

33、-!UPJYfll.2 So 1m1fJ$YA?3.1J i.i,QAJ1fJfll.$tfrbf,a*lfim$11 A,Y1LltB 811ft;D*lfi m$16 A,Y-!LltB 3 m$o 1JotFWfsAJ$y A?1m1fJfflT$Ym$?4.JLlmrmJ1JMfe:?Jffi,*lfiA%10 tR,9!U$8 tR;*lfiA?J 12 tR,9!UfxJLlff 11JMfe:r%!Uffi o t!1t!fi11JMfe:t?Jiu 11 tRffi,tt:1:1.JaJLtR?21 191J rm(1)IfAJLlB-0 1m1fJ*;mz:r!tr T-T:

34、O*!ja-g-IEM4ig-*4 A;o*-g-,IEMB-*6 Ao jI T$J;A?tta-H-,IEf 4iB-*4 A,t r4iB-*4 A,.mu$4 A;-fr,IEM4iH-*6 A,t=f4iH-*6 A,ITTUJ;6 Ao fflH-sJ:(6+4)-=-(6-4)=5()fAJsA:5x4+4=24C A)=IT 24 Jo 1.IAfm-0*4i:,cfm 200*,fm%1E:-lt8l1l-lt 8:,c;*4i:,cfm 280*,fm%1E:-lt-lt43co-lt$Y*?2.Jlr itut=-tttJlo O*4i:,ct=8014.mu 5 3ci

35、1%nx:1f:%-;o*4i7ef=10014,ITTLlf(W 4 7e%nx:ff:%-o 1ltJl-$:J;lf?3.;J3f$A EJ3 tmU Gt-tl!3ff?o O*4i;JBt1-i 30=f*,1lli8Jt:ilstU 2 1JBt;iiO*4i1JBt1-i 50=f*,1lli8JtAI tlW 2;JBtiU G!tgo EJ3 G W1tfilt1Ee:PT*?4.m-t&lrrJl#sr*lt,O*1Eti r 3 1Jr,#1$2*;o*ret1 r 4 1Jr,JE l*iU#Do#$Y*?rtt$:P*?22 191J 11ru(PJ1fJ IJm.0

36、0:11-:t5,iio*A 114*,ITTUFo Y 2*;fin*1w 2 A)118*,rA113*,00-:t5tf11%o 1Jm.00:ff00-:t5$Y*?1J1J 2 AA118*,rA113*00-:t5tir11%,tr1i0*1ru 2 A mA113*,Y1UFoJtlr 2x(8-3)=10(*)o 11-:t5sJA:C 10+2)-;-(4-3)=12(A)OO-:t5 8*:12X4-2=46(*):IJm.00:ff OO-:t5 46*o 1.tumi*rsJm sJatrsJ1Jt tJf,;tti:J=t 2 tll*11t 4 tl,;tt*tll

37、 11 s*,f$7JWctUFoT 12 tl;iio*tl117 tlUtt1l%o-ffl$Y*?2.1 JtI*-Wr,?t*Ao fio*;Jti:f=t 2 AA?t 41-,;ltA?t 2 1-,$tfj 41-;JlO*1 A7J 61-,;JtA7J 41-,XiWc 12 1-o 1 JtI*ff$YA?1 JI*$Y1-fir?3.9m1i,ff 12 AA*m 7,ff 20 AA*m 6,;JtA*m 5,f$jifT 148 ;iiO*ff 30 A*m 8,ff 8 A*m 9,;Jt A*m 10,t$7Jf!cjFoT 20 o Wff$Y?23 i91J(

38、W3W3*s11x:?k1=i 161,ntP1=i 44 o WJWJ*sJx)J.JJlj 1=i$Y?Nl5!-1 16,Rfxt,tlffJtmit1=intp 2xl6=32(),f_t1=i 44,RJtp,t 1B1Jlf N$44-32=12 C,R),ili JJKlf N aJ Jffi l2SI 1 fFx T o EEr-Rt-Rx$2 ntP,$iliBJ 12 B!fliJctr1=i 12-=-2=6()-=fo xt1:il6-6=10(,R)Nl5t=1 16 t-=f,tJgJtmit1=in!fl 4xl6=64(),1Eli_t1=i 44 RB!P,t

39、B1Jffffly T 64-44=20(),ili:ElKlf 6lB1J1*12S11x -=fT o 83r-x%t-R-=fYWgB!P,EJT 20 QB!fJtr 10,Rxo 1:i 16-10=6()0 :W3W3*aJx?tJjlJ1=i 10 QfQ 6 R o ti:J!gJtJ!foJ,aJ#ffl0j1:i:=(Jtr1,J1tP-x%B!JJxJtr1,:?k)-=-(B!P-xtBtP);x%=Jtri,:?k-o 1.-0J:.1iJi$fQWg-1t$106 m 1fJ1=i 344,R$o i$-1-$?tJJU1=i$Ymi?2.-fftjJyt!ZT-f

40、f1J,Bott 11:?k 2 JM,1Jt 1 1:?k 5 fil!o j:%J:.-1:i 101:?kfQ 41 JMo tf ff;J)J.jjlj1:i$Y1?24 f91J 100-ifo 140-im,:kto 1 A7J.3-im,1Jfo 1 A7J.1-imo:k1Jfo 5tJJ1Jf=TYA?a*jcfl /Jfl 7J.jJfJ 1tflx 3-itl JMlJftm 1-im -JM1Jfto*-T-%0H.ffl0A:kfO BJftm:(140-l00 xl)-:-(3-1)=20(-i)1 JfasJft.:100-20=80(-i):k1Jfa%JJIJ

41、f=T 20 AfO so Ao ti:ft;JftBJrf=j 0Afft,xt%JoJBJ0A:ixtHm,711 1t 1J lJl ,1t m 1t x,1t m 1t,1t m 111=IM-7.1g,:OJ:1i ili 0A BJ1rxr!-*sJ7J1f o ID ffl 1rxr!*W.fm-JJ!i:1elOi1JfQ,lliit5t 100 m,ili-*sJ 140-I00=40(-i)tl7J:k fU4tfA7J.T 3-1=2(-i)m,EJT:kfof=j 40-:-2=20(A),1J tof=j 100-20=80(A)o 1.1Jot1rx1msJ 10

42、,4tf3C(.tt 4 tl,4-tftt s tl,1tgff1-tt 44 tlo 1Jatttx1maJ(_f03(5tJIJf=jy?2.52 tlfr,-*11 fro jt:fft4tf:kfr 6 A,4-tf;Jfr 4 Ao:kfrflfr-JJIJf=jJL?3.1Z9(1)I 30 fi:iJtfil;t(IK 1 205 5c,4-tf ffl T 5 5c 10 5co 1 5 jcfl 10 jclJ 7.Jjfjf=jy?25 19,j JjP*T-x%lO,x%t$16 R,1fJ-1fjj!p 158 Ro;jP%*BJxt?J.Jj1J1f$:P 9?a*

43、kAx BJ;gR9=xt t$1J 16 R,1f11JBiPJ1Jt*1J 158-16x2=126(R)o Bt,x%BJR-$,l Rxtfa l 91f 2+4=6(R)BtP,EfrkAX!J*1f 12676=21 CR),x%_t1f 21+16=37(9)o :/JP-%*BJxt%J3U 1f 37 Rfa 21 Ro 1.*1fr7J 3 5GBJi.3J*ra1fr7J 7 5GBJi-B-*,4ET 580 5Go B i-B-*tti.33*$40*,i33*fai!t*?tiUT$Y*?2.;Jffi*T-8 5c 1frsJ*fa45G 1 frsJ,ffl 8

44、00 5G,Bt*y 25 fr,*fa?J.JJU T$:J;fr?3.OO-=f:5tK*i-=f:5 50*iiffimi 30*,ffl 310 5G,1*i-=f:5 t 1*:iiff imj 3 7Go 1*i-=f:5fa 1*iiffimi%JJU7J$:J;5G?4.*lfI 5 QJtfa 6 Rt-fFff,ffl 760 5G,l Rftt 1 Rt-1Ff1 20 7G,1 R JE.Jf fa 1 R t-f Ff1?J.JJIJ 1J$Y 5G?26 1&i&ff1$xt,i:iJ1i 2ox5=100(?t),iR1t T 60?t,100 Jtt 40?t,

45、re&-WdT-o&fflffl to 3*tJ!f$BJ-d1xt BJ t T 5+3=8(*)0 40?).r:p JL 8?J.,tJt&1$fflT JLo t11$fflBJ:(2ox5-60)-=-(5+3)=5()1xt:20-5=15(if!):1mxtT 15 o 1.TT1Jott,it-12,xt-:11!1i 10?).,ffl-1f to 4?to T TtiT tBJ,1i 78?to TTxtT JL:11!?2.Jjfii1-r-XP!ilit,15 o t11xt-1 8?).,1ffl-1 f to 4?to 1 J1i 72?J.,m1xTY?3.fil

46、$mrlR:i!fN 200 ffi,AJ1Eti 30 jc,ffi-ffi,1.ELfil ,tt1im1 200 5to fil:i!dE,ftfilit 3700 7Ga fNtT JLffi?4.IAW1Rtffli 250 ,t1Efil-iU sJ:f:filfil 20 5c,tffl-1t m 100 7Go fil:Jttff,5,IA1i 4400 7Go 4t3fELtff1T JL?27 19,j Jj*T-x%fO,x%fOft 78 Q B!P ttx%B!P 1,ft$6 p O Jj*sJx:,t,J$Y Q?1ft.msJxPJ J!foj 12 i:J=r

47、,B I BJ xB!P B!P BJ fO,*x B!P B!D BJ o 1Ei 78 Pt,t18Jt 78x4=312c Q)Btfl,rmxB!P79,ntp txntpgJt$312 Q o rrff_tp$6 Q,-m1BJB!P ttxB!P$sJ ti_t$312-6=306(,R)0 fJntExtt*,t*-Q,B!PY 4 Q,x%B!Pt1Ja 2 fl,l:1PB!Pttx%B!P$BJ BtPi:J=rtJtY 4+2=6(Q),rm 306-:-6=51(p),(1sl.u:tx 51 p 0 :XBJi:(78X4-6)-:-(4+2)=51(Q)BJ:78-

48、51=27(Q):x?J.JJU 51 P fo 27 Q 0 2.fJn*JjiIf Jflift 52,7C*RAJim 4 T,/JJftLAJim 2 T,*IL t1J Jf1i,g,ft$T 28 Timo 7C 1 JJfli?J.JJ1J$Y?3.Ihttr1fJ*T lmlfOlitWo T lml 14 19 5c,tJ$1 4 11 5G,T lmlfOmtJ$,ft*T 1614,*T lmlttJ$tl:T 214 5co T lmlfOfiltJ$?tJJU*T$Y14?28 19,1 12Y1J!fmr-fF 1 il,-3fit,1Jmr*-1:Effi 1%1

49、il_t,1J*-1ffi 2%,1J*-1:Effi 3%,1 Jam*-1ffi 4%,0B1rJ1,:1:mx1il,m-rx.r.rt-tFX ,m=rx1m-rxxFotctiWg3JLlX,m rx N.r.-rmt-tFX,m 1mrx NtctiW131LlX JX-H r,15Jffi+ZXX1ilFo,1 J*-1ffiJL%1 il.r.?1 2 E.3*11 11 BB?._.3 4 11 1 *E.3 B?1il00 3fEt _.X kk-Jr:,%-J(-l!A=1x J j1iLBJ 11tt$:J ju 3f ft Bt1:E 3%1iII 121tufijg

50、:3-1-2=lj(4 ll97X 3-Im iXXJ-l I fU1*!it o 10-:-4=2 2 :/J*-1:Effi 2%11L.Lo 1.O OOM:iE1f%ABCO fOiE1r:Jf3 ODEF BJ:ill*f 2 ll*,-;JA O,ili,JtfU F,?tFotB-fiYr11fo(fu O,tJ31g)Ji1-=f 1054 J1I B*Fo1,-r O 1,100 i:p BJ-,?2.o OOM:-!h1fl=t1:E 1%1ir=i:_t,Bffi 1 iXIEJt 1 tl5-,tUJt 2%1iLI;ffi 2 iXNJE 2 tl5-,fU:12S