四年级奥数全册校本教材

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7|}=ᡃ℉fḄᜧ;᳛ᓟJᐷḄᦪ#᝞ᢣ஺;JᐷᦪᨵFᱯḄy,“|}~ᐷ”஺Ḅ=᪵ḄᔠJᐷ1ஹ2ஹ3——1ஹ2ஹ3ஹ4ஹ5E—1ஹ2ஹ3ஹ4ஹ5ஹ6ஹ7ᙢ¡¢£ᦪᯠ¥£Ḅ¦ᦪ§¡¨©ª«⍝Ḅ▭yᦪ2¯°yᦪ஺Ḅ±²ᔊBCM,“³´²”“◞ᜋ²”“·:v”᜜yᑣ¹“Kᒕ¦»ᳮ”஺ᨵyᵨE✌½ᭆ¿#F)⚪ḄÀÁ¢yÂÃÄᓝÆÇ᪛᫥ÊËEÌÄÍÎᙊᨴÑÒ◀ÔÕǪ֫஺×ØÙ=DE£¦ᦪÚ$70,DÛ£¦ᦪÚ$21,D¢£¦

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9஺2ஹ᰿"#ᚆḄᦪ&'(ᜧ*&+᰿"#ᚆ,-᎛/ᱯ123ᨵ45&6ᙠ89:;<“ᡃ6?ᦪ&'(@A᪵”5&6;<“@A?Dᕖ᰿"#ᚆ;<“F6GHIᦪᯠK?LMᡃ/NO⍝F6QRIḄSᦪ”TU;<“ᡃVWᡃXYZZ஺”᰿"#ᚆ;<“SA[ᔳ]ᙠQR஺F^_GHIᦪᔳ஺”“ᡃI[஺”TU;஺“ᙠ`ᦪaba18஺”“cba136஺”“d27஺”“dFᡠIḄᦪ஺”TUᢥ᯿᰿"#ᚆḄ⌕i

10?M஺:jᨵ;klᫀ᰿"#ᚆ/;<“ᨬKoᦪ254஺”TUpᕆ᰿"#ᚆ;Ḅrs┯X:@AkᩭḄᕖᜐv3wxyz{|}⚪᪆

11¸¹ᡈd᦮¤¥¢ᡂ᧕kḄ஺¼1<9+99+999+9999ᑖ᪆y«l<`½bᦪᑖ1¾¿10ஹ100ஹ1000ஹ10000cᙠ`À⚪Á-¦ᵨd᦮D¼᝞Å99°ᓄÆ100—1஺`,&ᦪ&ÂᵨḄªᢈz஺9+99+999+9999=(10-1)+(100-1)+(1000-1)+(10000-1)=10+100+1000+10000-4=111060--------------AÈÉÊËÌÍÎᨵRᨵÏÐÈÐÑ--------------ÊÓÔÍᨵRÕÏ஺

12Ö1,99999+9999+999+99+92,9+98+996+99973,1999+2998+396+4974,198+297+396+4955,1998+2997+4995+59946,19998+39996+49995+69996¼2<489+487+483+485+484+486+488ᑖ᪆y«l<âãäåæbᦪç]·6è᦮ᦪ490¾¿ᡠY⌱490Æëìᦪ஺489+487+483+485+484+486+488=490X7—1—3—7—5—6—4—2=3430-28

13=3402II<᝞⌱480ÆëìᦪXY@᪵Öð1,50+52+53+54+512,262+266+270+268+2643,89+94+92+95+93+94+88+96+874,381+378+382+383+3795,1032+1028+1033+1029+1031+10306,2451+2452+2446+2453¼3<ñ☢ᔜ⚪஺(1)632-156-232(2)128+186+72-86Aᔊø¦È23ùú¦ÈûüÐÈÐÑᦪ&¦Èýþ஺ÿ᪷

14ᑖ᪆ᙠᨵḄ᝞ᨵ᪷!ឋ#$ᣚ&ᦪᡈ)ᦪḄ*+஺(1)632-156-232=632-232-156=400-156=244(2)128+186+72-86=128+72+186-86=(128+72)+(186-86)=200+100

15-./0☢ᔜ⚪1,1208-569-2082,283+69-1833,132-85+684,2318+625-1318+375A40☢ᔜ⚪஺1.248+(152-127)2.324-(124-97)3.283+(358-183)

16)EᦪFGHᦪFᦟJK•*FMN“PQRS)ETUVWA᝞PXYᨵᓝ[\Pᔛ^_`abcᕖWueFMfgᙢN⍝“`aᢸ^ᓝ0klmᑖ᪆ᙠᨵḄ&)nᔠᨵp^qrst᝞u☢a“+”t.ᑁḄxUyz᝞u☢a“”tᑁḄ&{⌕yᡂ)){⌕yᡂ&஺ᡃH☢ḄEᭆpu☢a&tᣵUyzu☢a)tᣵ⌕y஺1.248+(152-127)324-(124-97)=248+152-127=324-124+97

17=400-127=200+97=273=297£ᓄpᓄpb஺—283+(358—1?-----——-----------=283+358-183=283-183+358=100+358=458-._0☢ᔜ⚪1,348+(252-166)2,629+(320-129)3.462-(262-129)4.662-(315-238)

185,5623-(623-289)+452-(352-211)6,736+678+2386-(336+278)-186ᔠᳮ᣸{⁚஺__᪷A⁚0☢ᔜ⚪஺(1)286+879-679(2)812-593+193ᑖ᪆ᙠᨵḄ&)Enᔠ⚪ஹᨵ᪷⚪¡Ḅᱯ£¤ᵨ¦ḄEqrsu☢tḄE§¨ᡃe©Eᭆpu☢a&¦HUyzu☢a)¦H⌕y஺(1)286+879-679(2)812-593+193=286+(879-679)=812-(593-193)

19=286+200=812-400=868=412------------e]-----------------------------------F.ᦪFḄªEa«ᦪF¬®-.¯0☢ᔜ⚪஺1,368+1859-8592,582+393-2933,632-385+2854,2756-2748+1748+2445,612-375+275+(388+286)6,756+1478+346-(256+278)-246■4±²ᝯ´!µ¶⌕£·E¸¹ᦪ᣸ᡂ

20ᑡ»pᦪᑡ஺ᦪᑡḄ¼ᦪ»p⚗஺ᐸ⚗»p✌⚗ᨬÁ⚗»pÂ⚗ᦪᑡ⚗Ḅᦪ»p⚗ᦪ஺ÃÄ⚗ÅÆÁ⚗ᐸÇÈḄu⚗ÉÊTÇḄᦪᑡ»pÊᦪᑡÁ⚗u⚗ḄÊ»pËÊ஺ᙠeÌ⌕ᵨᑮÎÏÐÑ⌕ḄË“Ò⚗Ë”!“⚗ᦪË”஺Ò⚗ËÓ⚗=✌⚗+Ô⚗ᦪ1ÕËÊ⚗ᦪË⚗ᦪ=ÔÂ⚗-✌⚗Ö+ËÊ+1

21×ᕡᦪF1ஹÙÚÛḼ/ᐢᑮÞßHtᓬ¼ᐢᜧᭆ/_ᓟãäÙÚḄå滯çHèéê᝞ë»ì஺ᐜ»3îï0»ìÁÊ஺A⚪ð±A1ᨵᦪᑡ4,10,16,22,…52,eᦪᑡᐳᨵbc⚗Wᑖ᪆ó᧕õöeaÊᦪᑡËÊp6,✌⚗a4,Â⚗a52,⌕´⚗ᦪ÷øÛᐭ⚗ᦪËú஺⚗ᦪ=(52-4)+6+1=9,ᓽeᦪᑡᐳᨵ9⚗஺-.

221,Êᦪᑡ✌⚗=1,Â⚗=39,ËÊ=2,eÊᦪᑡᐳᨵbc⚗W2,ᨵÊᦪᑡ2,5,8,11,…,101,eÊᦪᑡᐳᨵbc⚗W3,üµÊᦪᑡ11,16,21,26,1001,eÊᦪᑡᐳᨵbc⚗WA2ᨵÊᦪᑡ:3,7,11,15,……,eÊᦪᑡḄ100⚗abcWᑖ᪆eÊᦪᑡḄ✌⚗a3,ËÊa4,⚗ᦪa100஺⌕´100⚗᪷“Â⚗=✌⚗+ËÊX(⚗ᦪ1)”ú஺100⚗=3+4X(100-1)=399-.Ä1,Êᦪᑡ✌⚗=3,ËÊ=2,⚗ᦪ

23=10,ÿḄ
⚗2,L4,7,10……ᦪᑡḄ30⚗஺3,ᦪᑡ2,6,10,14……Ḅ1003ᨵ᪵ᦪᑡ1,2,3,4,…99,100o#$ᦪᑡᡠᨵ⚗Ḅ&஺ᑖ᪆)*+᝞-ᡃ/01,2,3,4,…,99,100)ᑡ100,99,3,2,112ᑣ4ᑮ(1+100)+(2+99)+(3+98)+…+(99+2)+(100+1),ᐸ;<=>?ᑁḄAᦪḄ&B101,ᐳᨵ10010112ᡠ4Ḅ&DᡠᦪᑡḄ&Ḅ2EF◀H2,DᡠᦪᑡḄ&஺

241+2+3+…+99+100=(1+100)X100+2=5050L☢ḄᦪᑡᦪᑡNẆPQRᡠᨵḄᦪᑡBSHᵨU☢ḄVW&ᦪᑡX&=(✌⚗+
⚗)Z⚗ᦪ+2VW[\]ᦪᑡ&VW஺^_`abU☢ᔜ⚪஺(1)1+2+3+-+49+50(2)6+7+8+…+74+75(3)100+99+98+…+61+604ᦪᑡ2,4,6,…48,50Ḅ&஺ᑖ᪆)*+ᦪᑡᦪᑡᡃ/SHᵨVWab஺

25⌕ᦪᑡḄ&✌ᐜ⌕$⚗ᦪ⚗ᦪ=(
⚗-✌⚗)♦V+1=(50-2)4-2+1=25✌⚗=2,
⚗=50,⚗ᦪ=25ᦪᑡḄ&=(2+50)X254-2=650^_habU☢ᔜ⚪஺(1)2+6+10+14+18+22(2)5+10+15+20+—+195+200(3)9+18+27+36+-+261+2705ab(2+4+6+…+100)—(1+3+5+…+99)ᑖ᪆:

26j᧕QRlmᦪ)mᦪBᦪᑡḄ&noSHᐜᑖp$q/ᔜrḄ&,ᯠt1m஺uvᑖ᪆wSHQRAᦪᑡᐸx01~100100ᦪᑖᡂz᜻ᦪ)ᏔᦪAᦪᑡ<ᦪᑡBᨵ50⚗஺noᡃ/[SH0Aᦪᑡ;Ḅ<⚗ᑖp}~1mS4ᑮ50F$ᡠᨵḄ&஺(2+4+6+…+100)—(1+3+5+…+99)=(2-1)+(4-3)+…+(100-99)=1+1+1+…+1=50^_

27ᵨabU☢ᔜ⚪஺(1)(2001+1999+1997)-(2000+1998+1996)(2)(2+4+6+-+2000)-(1+3+5+-+1999)(3)(1+3+5+-+1999)-(2+4+6+•••+1998)⍝⚪Ḅᙠzqᐸ•⚪஺ᑭ5ᦪᦪ⌕)ᡃ/Nzஹஹ`ஹ¡¢££¤¤ᙢ¦┯ᙠ¨©D᪀ᡂz«ᩖḄ®஺⌕¯°±ᙢaᦪ²;ᡠᒹ´Ḅµ¶ḄᦪD◤⌕¸¹ᙢº»ᮣ½ᙢ¾ᵨᨵᐵḄ&ÀὃÂÃᦪḄÄÅÆÇ4ȱḄÉ-஺

28⌕°±ஹÊËᙢaᦪÌÍÎÏHU:1,ÑÒlᦪḄᱯÔ&ÕᓄÄÅ஺2,⌕ᢥØḄÙÚᦪ]ᑮÛ£«Û⍡Ý஺1ᦪ$U☢;ᨵᩩ஺IIIIABCDᑖ᪆)*+⌕ȱ*+²ß⚪◤⌕ᡃ/ᢥ᯿ØḄÙÚᩭᦪ]ᑮÛ£«Û⍡Ý஺â;SHã$âA$QḄÛåᨵ3ᩩABஹACஹADéâB$QḄÛåᨵ2ᩩBCஹBDéâC$QḄÛå

29ᨵ1ᩩCDono;ᐳᨵ3+2+1=6ᩩ஺^_:ᦪ$Uᑡ;ᨵᩩ஺2ᦪᦪU;ᨵ┦஺

30Eᑖ᪆ᦪḄ&ᦪḄ²ë;Ḅᩩì1¢íLḄno⌕;ᨵ┦S᪷ïVW1+2+3.......ðXìᦪ141+2+3+4=10ðñ^_òUᑡᔜ;ᔜᨵ┦

31ᑖ᪆)*+:;ADóLḄ<ᩩ)⚔0᪀ᡂ`[DõADóLᨵöᩩ,

32D᪀ᡂz`n÷ADLᨵ4ᐳᨵ1+2+3=6ᩩᡠH;ᨵ6`஺^_`ᦪᦪU☢;ᔜᨵ`஺4ᦪᦪU;ᐳᨵ`஺ABCD

33ᑖ᪆)*+)øù1ú;zᩩEF,no`Ḅᦪ~AD&EFL☢Ḅ)0ᡠûᡂḄ`ᦪḄ&஺üᯠ,HADLḄ÷ýóḄ`[1+2+3=6ᡠH;ᐳᨵ6X2=12`஺^_hᦪᦪU☢ᔜ;ᔜᨵ`஺

345ᦪᦪU;ᨵ¡஺ABCDᑖ᪆)*+ᦪ¡)ᦪḄ²ë஺SH᪵Àὃ;Ḅ¡ḄᦪþÿABᡈCDḄABḄᩩᦪ1+2+3=6ᩩᡠᨵ6஺!ᦪ"ᦪ#☢ᔜᑖ'ᨵ()஺

35),-.Ḅᵨᜐ1ᨵ.23ᦟᦪ.5,-.ᨵ67ᵨ஺ᦪ.5891“;<=>?@ABC"DῊ>ᮞ•HHIIJKLM•NCOPQ”“SᯠUḄV஺”.2W஺0“XY஺UḄVZ[YHHIIL\]^X_UM@_COPQ”`6abcde"fg⚪ij:lmno8⚪Ḅ᪷q஺rslmtuvBwᱥḄyz{|ᓄcdᙠ"

36#ᡃ=#☢ᩭbcd11.᪷q;ᦪḄᐵbBcdBᡠ⌕Ḅᦪ2.᪷q◞Ḅ;ᦪḄᐵbBcd,Bᡠ⌕Ḅᦪ3.⌕ᗐ=᦮ᦪqḄὶ=bBcd4.ᦪḄὶ=XḄ¡¢ᩭᳮn¤⌕¥ᨵᳮᡠtBḄcd¦KL§¨Ḅ஺©ᕡᦪ.1«<ᐜᔣ§ᓅ¯32km,°ᔣ§ᓭ¯36km,8#M²³§¨Ḅজ9µBy¶4kmঝ9µBy¶ᜧ48kmঞ9µBy¶68kmট9µBy¶»4kmঠ9µBy¶ᜧ4km»68km½11,3,5

37¾1:ᐜbB#ᑡᦪ᣸ᑡḄcdÁ᪷qcdᙠÂÃ@〉SḄᦪ஺1,4,7,10,(),16,19ᑖ᪆1ᙠËᑡᦪḄ;ᦪḄ̦3,ᓽ"ᦪÎ3¦ÏÐ☢Ḅᦪ஺᪷qË"cdÂÃ@ÑḄᦪL110+3=13ᡈ16—3=13Ó☢ᢥ᯿"ÖḄ×Ø᣸ᑡḄ"ÙᦪÚÛᦪᑡ஺"1ᐜbB#ᑡᔜᑡᦪḄ᣸ᑡcdᯠÐᙠÂÃ@〉SḄᦪ஺(1)2,6,10,14,(),22,26

38(2)3,6,9,12,(),18,21(3)33,28,23,(),13,(),3(4)55,49,43,(),31,(),19(5)3,6,12,(),48,(),192(6)2,6,18,(),162,()(7)128,64,32,(),8,(),2(8)19,3,17,3,15,3,(),(),11,3¾2ᐜbB#ᑡᦪ᣸ᑡḄcdᯠÐᙠÂÃ@〉SḄᦪ஺1,2,4,7,(),16,22ᑖ᪆1ᙠËᑡᦪÜ4ᦪḄ;ᦪḄÌÝÞ1,2,3oᵫàá7âÂÃ@Ḅᦪ)4,ÂÃ@Ñ17+4=11஺

39ãäåᡠḄᦪ§¨Ḅ஺ÑḄᦪL17+4=11ᡈ16-5=11æ1ᐜbB#ᑡᦪ᣸ᑡḄcdᯠÐᙠÂÃ@〉SḄᦪ஺(1)10,11,13,16,20,(),31(2)1,4,9,16,25,(),49,64(3)3,2,5,2,7,2,(),(),11,2(4)53,44,36,29,(),18,(),11,9,8(5)81,64,49,36,(),16,(),4,1,0(6)28,1,26,1,24,1,(),(),

4020,1(7)30,2,26,2,22,2,(),(),14,2(8)1,6,4,8,7,10,(),(),13,14¾31ᐜbBcdᯠÐᙠÂÃ@〉SḄᦪ஺23,4,20,6,17,8,(),(),11,12ᑖ᪆ᙠËᑡᦪ`"ᦪèC3ḄÌ`éᦪ`æᦪÎ2Ḅ{`êᦪ`éᦪèC3ḄÌ`!ᦪ`êᦪÎ2Ḅ{`ëᦪ……Ýàcd8Ð

41☢Ḅ"ᦪL117-3=14,11Ü☢ḄᦪL:8+2=10éᐜbBcdᯠÐᙠÂÃ@〉SḄᦪ஺(1)1,6,5,10,9,14,13,(),()(2)13,2,15,4,17,6,(),()(3)3,29,4,28,6,26,9,23,(),(),18,14(4)21,2,19,5,17,8,(),()(5)32,20,29,18,26,16,(),(),20,12(6)2,9,6,10,18,11,54,(),(),13,486

42(7)1,5,2,8,4,11,8,14,(),()(8)320,1,160,3,80,9,40,27,(),()¾4ᙠᦪᑡ1,1,2,3,5,8,13,(),34,55……ÂÃ@Ñ67ᦪQᑖ᪆1ãíîlmஹᑖ᪆Xðyñ1=`éᦪòó"ᦪ¦ÏôÜ☢;ᦪḄ{஺᪷qË"cdÂÃ@ÑḄᦪL18+13=21ᡈ34-13=21☢ËᦪᑡÚÛᦾöVᑗ(øᜧᑭúû℉ýᦪ.5)ᦪᑡ^ÚÛ“ᐢÿᦪᑡ”஺

43ᐜᯠᙠ〉Ḅᦪ஺(1)2,2,4,6,10,16,(),()(2)34,21,13,8,5,(),2,()(3)0,1,3,8,21,(),144(4)3,7,15,31,63,(),()(5)33,17,9,5,3,()(6)0,1,4,15,56,()(7)1,3,6,8,16,18,(),(),76,78(8)0,1,2,4,7,12,20,()5☢Ḅᦪᢥ!"Ḅ#ᔠḄᙠ%〉Ḅᦪ஺(8,4)(5,7)(10,2)(□,9)

44ᑖ᪆:*+,-.ஹᑖ᪆01234Ḅᦪ56Ḅ712᪷9:!o%ᡠḄᦪ<=412—9=3>4☢Ḅᦪᢥ!"Ḅ#ᔠḄᙠ%〉Ḅᦪ஺(1)(6,9)(7,8)(10,5)(%,)(2)(1,24)(2,12)(3,8)(4,□)(3)(18,17)(14,10)(10,1)(□,5)(4)(2,3)(5,9)(7,13)(9,□)

45(5)(2,3)(5,7)(7,10)(10,□)(6)(64,62)(48,46)(29,27)(15,□)(7)(100,50)(86,43)(64,32)(□,21)(8)(8,6)(16,3)(24,2)(12,□)B7C7DE⚪G⚪H᪆:IJᦪḄ7KLMNOḄDᦪᐵQR:ᦪSTḄ<ᵨ⚪VW7DE⚪஺XY7D<ᵨ⚪ḄZ[ᦪ\ᐵQ4

467+^Dᦪ+1`=bᦪbᦪXDᦪ=ᜧᦪ^7!bᦪ=ᜧᦪ`14e᪥ᨵhᢈj7ᦑljᐳ480[hᢈjḄ[ᦪᦑljḄ3D஺rjᔜᨵST[tuᕡᦪe4wxbe^1`y42{e|}ᦻᓄᦻἠ5ᐗᦻᓄ"4ἠ〈1஺!,^1`e|ἠ!ᐳ◤⌕^`ᐗ஺Y4170ᐗᑖ᪆KXY:=ᳮX⚪ᡃMᩭᑖ᪆:

47ᦑ
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49É1,ÊᜧËÌÍஹÎஹÏᐳ960ÐÌÍḄÐᦪÏḄ3DÌÎḄÐᦪÏḄ4D஺ÍஹÎஹÏᔜÌSTÐt2,ᵬஹµஹÑÈᦪN7360,IJᵬµḄ3DѵḄ2D஺RᵬஹµஹÑᔜST஺3,ᖪÒᨵÓÔஹÕÔஹᙊ×Ôᐳ560Ø,ᙊ×ÔḄØᦪÕÔḄ3DÓÔḄØᦪKᙊ×ÔḄØᦪÙ᪵S஺ÓÔஹÕÔ7ᙊ×ÔᔜᨵSTØt

50Úἠp1ᦪeᦟᣴÝÞßàáâᑡàºãᩭÚἠäåæ0ᑮἠ஺ᦪeᦟᣴញéêᜮᜧì0ᑡàºí40ᑮî⊡ἠð஺ᦪeᦟᣴ4:ñ¤·0ᑮ£ἠᡃ0J⍝ᡃ⌕}óôõ34ᨵÈjöᐳ÷330[jBÉjöḄjB!Ḅ2DBÈjöḄjBÉḄ4D஺jöᔜ÷ST[jtᑖ᪆KXY4B!jöḄ[ᦪ¡1¢£¤BÉjöḄ[ᦪ:᪵Ḅ2¢BÈ:᪵Ḅ2X4=8¢ÈjöḄ¦[ᦪ:᪵Ḅ1+2+8=11¢஺ᡠ·B!jö÷3304-11=30^[`BÉjö÷

5130X2=60^[`BÈjö÷60X4=240^[`஺È1.ᵬஹµஹÑÈᦪN7400,IJᵬµḄ3DÑᵬḄ4D஺RᵬஹµஹÑᔜST஺2.ÈᙽÕ¾ᐳ²621ᓟ¯B!ᙽḄ²\BÉᙽḄ3DBÉᙽḄ²\BÈᙽḄ2D஺ÈᙽÕ¾ᔜ²STᓟ¯t3.ᵬஹµஹÑÈúûüᐳúû1200ÀᵬüúḄÀᦪµüḄ2DµüúḄᦪᦪÑüḄ3D஺ÈüᔜúSTÀt44Tᐜüᕒrþ᪛7ᩰ᪛ᐳ216ᩰ

52᪛Ḅᦪ᪛Ḅ320᪛ᔜᑖ᪆᝞ᩰ᪛20᪛ᩰ᪛Ḅᦪ!216—20=196"#$%ᩰ᪛Ḅᦪា'!᪛Ḅ3஺ᡠ*᪛Ḅᦪ!196+
1+3=49"#ᩰ᪛Ḅᦪ!216—49=167"#஺+,-1,./ᨵᜧ2☢4ᐳ6300ᓟ6ᜧ2Ḅ78☢4Ḅ49300ᓟ6ᜧ2☢4ᔜᨵᓟ62,:;:<=>?ᦪ@AB=ᐳC168ᑖ:;ḄCᑖ:<Ḅ242ᑖ஺=ᔜCᑖ

533,@᪥GH720KLMᑖNOஹQஹRSTUVOUVᑖCḄRUVḄ38KQX4Yᕡᦪ@::;>?᥅ᡲ_B>?Ḅ⌱aK஺OஹQஹBbcd᪵fgT⌱ahᙠdcBQj⍗lcBmb-=nᐳᨵ=>?஺13o5STqrsᐳqr13602ᵬsqḄ2ᦪ!usḄ2usvs2402஺STsᔜq2ᑖ᪆wusḄ2ᦪxy1zᵬsqḄ2ᦪ!$᪵Ḅ2z஺Ꮇ|vsq2402

54STsᐳq1360+240=16002}'!usḄ2+1+1=4஺ᡠ*usq16004=4002ᵬsq400X2=8002,vsq400-240=1602஺+,~1,ST᪛sᐳ᪛1900ᵬs᪛Ḅᦪ!usḄ2usvs300஺STsᔜ᪛2,STᦪḄ!1540,ᵬᦪ!vᦪḄ7uᦪᵬᦪ40஺STᦪᔜ!3,:@ᐳᨵᳫஹᳫ᣸ᳫᐳ95TᐸQᳫ᣸ᳫ5T᣸ᳫḄTᦪ!ᳫTᦪIᡃḄldTn⚪ᡂᵨ*ᐸn⚪Ḅᑣ஺——k

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58ₐᨬ"◤⌕#"ᑖ?V⚪ᡃḄYᦪ[ὁ]ᨵ•ᡃḄ••0.[`?⍝ᦪ[⚪?bcdᓫf@ᜧ᝼h⍝D"j70kl7⍝⚪mn7o7o7op.....,,rᣚ>t.[u>⍝vVḄ`⚪`??bᯠxyz{ᐭ>}ὃ᝱ᯠxQ}ὃᯠxQᔣᦟ᜜ᯠxnᜫ>஺ᑖ᪆D⊤G./Ḅ./,7᪵<⁚ḕ/஺LPmOmKQL,OLPKQLm./{஺OₐPஹOₐSₐKQL<./{஺᪷vḄᑖ᪆<7᪵¡᣸DᐜOLPᵨ1ᑖ¤ḼKQLᵨ15ᑖ./

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605ᑖᦈÔÕÖ30ᑖ஺ᨬ"◤⌕#"ᑖ$C3D×91;ØÙGஹÚÛஹÜÝÞY.[./ᑮà[᪥âãä᎛᪥æçè஺ÙGᡭ┐◤⌕5ᑖÚÛᒹëì◤⌕3ᑖÜÝ¿íîL◤⌕1ᑖ஺âãᨵY᪥æ᪥æ᝞ð¡᣸ÞY.[ḄçèñòóÞY.[ᶇᙠâãḄ/õᨬö$ᑖ᪆D᪥æ÷tHçᶭ/ᨬöḄᐜçèçᶭ/ùḄᨬxçᶭòóÞY.[ᙠâãḄ/õᨬö஺7᪵ÞY.[ᶇᙠâãḄ/ᑖú@DÜÝ1ᑖÙ1+3=4

61ᑖÙG1+3+5=9ᑖ஺/õ@1+4+9=14ᑖ஺§¨Þ1.ᵬஹþஹÿ
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71ᑮ9ᫀÖ×Ø5050ÛÜÝt'4P@Ḅ@ÞßàáÅÆâãᐸhḄ·@7²Ýᝈ¼Rt'Ḅᦪ@åẠçèRᡂ--ᦪ@ᜩ#0{11ᕜë¸Ëì¸í|îï⚪ð᪆Zòஹ◀±Ḅì¸ó±ô⌕ᑭᵨòஹ◀±Ḅõ¸¼ö÷õ¸ឋùtúஹᖪḄüᓄþöÿ
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73*2025X125X4X8ᑖ᪆-./0RSTUVEFWX0ᙠ⍝YZ᝞\ᐜ^25-4=ZEFᑮ100a78^125-8=ZEFᑮ1000ab^100-1000=Zc&'d஺ceWᡃghᵨZ3iᣚk6lᔠk&'஺25X125X4X8=(25X4)X(125X8)=100X1000=100000GKqH☢ᔜ⚪஺

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76ឋDᣚᦪᡈ◀ᦪḄ஺158X614-79X3=1584-79X61X3=2X61X3=366ᕡᦪ0ᨵ1~9xᦪᡂwxᦪxᦪᵨᡂᦪZᨬᜧ/0964287531GKH☢ᔜ⚪஺1,238X364-119X52,624X483124-83,138X274-69X504,406X3124-

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78=123X6=8X4=738q32ᕡᦪ0<¯Ḅ°±²⚓᪗µṹ·ᵨ0~9Ḅᦪᐳ981x஺°±²ᨵ¹º⚓/0357GK»H☢ᔜ⚪஺1,612X3664-1832,10004-(1254-4)3,(13X8X5X6)4-(4X5X6)4,241X3454-6784-345X(678+241)¼12½¾¿h

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80*1ßaஹb⊤áᦪâ0aZ\b⊤áaḄ3>§{bḄ2>ᓽ0aAb=aX3-bX2o0(1)5A6(2)6A5oᑖ᪆-./0.©⚪Ḅᐵå¡ᢕç¾Ḅ²D஺⍝⚪âḄh²D¡0hè☢ḄᦪḄ3>§{èé☢ḄᦪḄ2>஺(1)5A6=5X3-6X2=3(2)6A5=6X3-5X2=8êᯠ²*¾Ḅh@ëìiᣚk@íîéḄᦪiᣚ஺GK1,ßaஹb⊤áᦪâ0aOb=6Xa

81—2Xbo304஺2,ßaஹb⊤áᦪâ0a*b=3Xa+2Xbo0(1)(5*6)*7(2)5*(6*7)3,ᨵwx᦮ᦪ¡AஹB,AVB⊤áA-BḄ÷ᙳᦪ஺ùúAV6=17,|A஺*20
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83Ḅᦪ¥ü¥Ḅᦪý☢Ḅxᦪ¹1,¥ᦪḄxᦪ¬hèé☢Ḅᦪ஺ᡠF3A5=3+4+5+6+7=25GK~1,᝞\5V2=2X6,2V3=2X3X4,03o2,᝞\2^4=24+(2+4),3V6=364-(3+6),8^4஺3,᝞2A3=2+3+4,52X4=5+6+7+8,lZ\x=15,x஺4!"#ᦪa&b,()a□b=a(a+l)+(a+2)+…(a+b—1)஺-.xD6=27,Xoᑖ᪆&34567ᑖ᪆89:;<=⍝⚪

84()@ḄBCDᯠFG@HIJ☢ḄᦪLM8NOLḄᦪPQRSTḄJU#ᦪV1,LᦪḄ#ᦪW@HIX☢Ḅᦪ8YZᓽx+(x+1)+(x+2)+•,•+(x+5)=27,3=#\]8ᓽ9^x=2஺_`a1,᝞2b3=2+3+4=9,605=6+7+8+9+10=40஺-.xU3=5973,x஺2,!"#ᦪa&b,()a□b=a+(a+l)+(a+2)+…+(a+b—1),-.95□x=585,x஺3,᝞1!=1,2!=1X2=2,3!=1X2X3=6,ᢥd(e5!஺52V4=8,5V3=13,3V5=11,9V7=25O

85ᢥd(e஺7V3ᑖ᪆&3467fghᑖ᪆=i#Z89:;

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