历年数学运算

历年数学运算

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时间:2023-07-12

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14ᒹᡭᓺâᐳ◤⌕362ᐗ஺¶ÔØÙ1XÜᘤ,1(ÞR,1ᒹᡭᓺâᐳ◤⌕A.224ᐗB.242ᐗC.124ᐗD.142ᐗ2007*Aã81.AஹBஹCa᪵åæḄÐ!çI520ᐗᑖᢥ9.5ᢚ9ᢚ8.75ᢚêëÐ!çI474ᐗA,BìåæḄ!çH5:4,A,B,CaìåæḄ!çᑖU45ᐗíA.250,200,70B.200,160,160C.150,120,250D.100,80,34082.î¡OPᓟ´ïᜩîСñḄ13´ïËᜩîᒕMḄ,5320.5´ïaᜩîᒕMḄ2´óᒕM2´«ᨵîôᐳ⌕î¡45´í4A.51B.45C.42D.3383.õᢇᵯᾯù®ù28®·óᒕ80%«ᨵùù85®·óᒕ1320ú«ᨵù஺ᢇᵯᾯᐳᨵ45úíA.3360B.3258C.2752D.280084.ûAüᨵý°I18%Ḅþÿ100ml2K100mlᐙᑖᔠ᎔100mlḄᡂA.9%B.7.5%C.4.5%D.3.6%85.A,B,C,D!ᳫ#$%&ᳫ'()*+#,-.⌕'(1012A#1'(30B#1'(20C#1'(10D#1'(40

15A.3B.2C.1D.O86.ᵬஹ7*8Ḅᨴᦈᐭ.<=ᦪᜧ@A@1OOOᐗC@1OOOOᐗ7112ᵬᨴᦈᐭḄDE7ᨴᦈᐭḄFGHIA஺ᵬஹ7*8ḄᨴᦈᐭᨬᜧIL<54ᐗA.3216B.3665C.3720D.374787.MNOP᣸RSTᨵ4+V-)-R48ᐸXV-)-R58Yᒕ28Tᨵ4+V-)-R58ᐸXV-)-R48GHR[MNOᨵ8A.43B.38C.33D.2888.ᵬஹ7*\]^᡻`AஹB*ᙢ-Ḅbc\defᵬஹ7*^ᓫh\dᑖi◤2Ck3Ck*^lkmAஹB*ᙢIᔣ$I⍗kᵬ^'7^\d6ᓟqAஹB*ᙢᐳᨵᓟqA.20B.30C.40D.5089.tuvwxᕒ)uvz10{Ḅᭆ᳛<80%,5uvᨵ4z10{Ḅᭆ᳛

1692.5ᵬ¡¢E47¡¢◤⌕280ᐗ4ᵬ¡¢E37¡¢◤⌕219ᐗ1ᵬ£¢◤⌕ᐗA.36B.26C.24D.2293.¤¥¦᪛¨©ª1ᜩᵫª1=«¬ᐜ¤¥1®¯¤¥ᒕḄ10ª2ᜩᵫª2=«¬ᐜ¤¥2®¯¤¥ᒕḄ’.....ªnᜩᵫªn=«¬10ᐜ¤¥n®±¦nᜩ²³ᡂ᝞¦)+«¬¤¥Ḅ®ᦪIAᐳ¤¥¦᪛A.46®B.51®C.75®D.81®94.tµ#¶·A,B*+µefAµḄ

17ூáὃãᫀ௃1.ூãᫀ௃Boæ᪆»m᦮¿Fὃ⇋ᐰ8ᕒ᝞¦lké▅ëáὃìíîEë☘ðáὃî◤⌕2084+1948=4032ᐗᦑ[ᨵ4032+(292+156)=98஺2.ூãᫀ௃Boæ᪆»òᵬஹ7ḄᡂóôÇxஹyᐗᑣᵬḄöóÇx(1+25%)x0.9=1.125xᐗ,7ḄöóÇy(1+40%)x0.85=1.19yᐗ஺ᵫ⚪ùúᑮ»[x+y=400,æú»ᦑ7ḄöóÇû19x240=2856ᐗ஺[(1.125x+1.19y)-(x-y)=65.6üæ»ýÇöó<þóḄ8.5ᢚḄᑭḄ40%ᡠ0.85x0.4=0.34,ᡠ⌱⚗ᨵ17⌱⚗◀17◀Ḅᫀ஺3.ூᫀ௃Co᪆!"#$%ᔠ'Ḅ(ᕒ*+,ᑮ15+5=20ᐗḄ/0஺1#ᨴ(ᕒ*%ᔠ'Ḅᨵ800x(l-97%)=24$ᐸ/05x800-20x24=3520ᐗ415ᨴ%ᔠ'Ḅᨵ1000x(1-98%)=20$ᐸ/05x1000-20x20=4600ᐗ61#ᨴ74600-3520=1080ᐗ஺4.ூᫀ௃Ao᪆!89:;ᦪ=>〈@+ḄAᦪᕈC61#A4;:;>〈16A஺15A7;:;>〈10A஺DE71;:>〈Aᦪ@+2AF89Ḅ:;ᦪx,ᓽᵨ(4+x);:>〈J>〈Aᦪ16-2X,KL:A(4+X)(16-2X)=64+16X-8X-2X2=-2(x2-4JC+4-4)+64=-2(x-2)2+72,ᓽMx=2JOᨬᜧR72஺5.ூᫀ௃B஺᪆!ᵫ⚪UDE1#VWḄXᦪᓰZ[LXᦪḄ6\#5=^3+1415VWḄXᦪᓰZ[LXᦪḄ6\_#=_,ᦑ1aVWḄXᦪᡠᓰ6\5+161177111----=—,Z[LXᦪ35+_-=60X1#VW615VW760x(c—e)46121246

18=5X஺6.ூᫀ௃Ao᪆!ᙢᳫ^ᩩjkᙌḄᕜn2oRᓟq,rs…uvwxz◞Ḅ|}26°46'-11°46''=15°,ᦑz~ᡂஹ=oᓟq஺180127.ூᫀ௃D஺᪆!ᵫ400ᐗv500ᐗḄWἠᦪzKDὅᡂ#᦮zMᙳ450ᐗḄWἠ஺F300ᐗḄWἠᨵxᑣᙳ450ᐗḄWἠᨵ(2200-x)ᦑ300x+450(2200-x)=840000,,x=1000:400v500ḄἠᦪozᡠzM900v300ἠᡠ(840000-300X)9ḄᦪKᓽᫀ஺8.ூᫀ௃D஺᪆!Fx$A$8ᡠ,ᑭz=1000x+1300y,4x+3v<40-ᵫᧇḄ▲ᑴ¢U1''#¤J¥D¦,I7ᙠᐸ▬©ª¦2x+5y<38%¥Ḅ᦮ᦪᨵMx=6,Y=5JzOᨬᜧR1000x6+1300x5=12500ᐗ஺9.ூᫀ௃Ao᪆!F«ஹ¬ஹᜩ¯ᡂḄ*°±ᑖ³xஹyஹz,*°L±-10X=#8(x+y)=403100,ᑣ!2(x+y)=20,,

19vy=(x-37)2+(x-62)2+(x-61)2+(x-47)2+(A:-49)2+(X-56)2=6x2-2x(37+62+61+47+49+56)+(372+622+612+472+492+562)᪷Ñ5AÒᦪḄឋÔMX=—2=--2x(37+62+61+47+49+56)=52JOᨬ¸R஺ᓽ“⚜/”52y2a2x6oᐗ஺Ö×r=/ᦪÌÍḄÎÏvᨬ¸Ḅ'”Ø▭^¦Ú/ᦪḄÎᙳRCÎᙳRᙠᦪÛḄ#ᱯÝឋÔ஺12.ூᫀ௃Bo᪆!(Ḅᔠ'᳛99.98%x99.95%x99.93%=(1-0.02%)x(1-0.05%)X(1-0.07%)=1-0.02%-0.05%-0.07%=99.86%O13.ூᫀ௃Co᪆!ᵫ⚪UDE^ஹßàáḄ├Lᦈᐭᐰá├ᦈᐭḄ50%+25%=75%æ740+120=160oᐗᓽ160oᐗᐰá├ᦈᐭḄ1-75%=25%,ᐰá├ᦈᐭ160+25%=640oᐗ஺14.ூᫀ௃Bo᪆!✌ᐜéºᨬºḄX᣸ᙠëᯠíîᒕßḄ4X⌱2Xðᙠ#ñᓽDᦑᨵ=6᣸ò஺15.ூᫀ௃Co᪆!K⚪¿ᨵᐹᦪÑDôᵨᱯRò஺Fºᦈᐭᕒ*Xᦪ1Xᑣ#õᕒ*4X.F2010á÷#õᕒ*Ḅ*ø1ᐗᑣºᦈᐭᕒ**ø6ᐗL*ø11x4+6x1=10ᐗ஺⚪ḄᦪÑùᐭß⊤!áû#õᕒ*ᦈᐭºᦈᐭᕒ*ᦈᐭLᦈᐭ2010á÷161x4+6x1=105áí1x(1.5+1)=2.510x(1+1)=20DEºᦈᐭᕒ*ᦈᐭ(20-2.5x4)+1=10ᐗ,#õᕒ*Ḅ10+2.5=4஺16.C17.B18.A

2019.B20.Do¸¬v¸Ḅᐷýᳫᦪz¤þÿḄᑣḄᐷᳫᦪᑖᡂ5ᑖᓽ5Ḅᦪ஺ᡠᡠᦪᑖ◀5,2,4,4,3,0,1,3,4,ᡠᨵᦪ!"2+4+4+3+0+1+3+4=21,ᓽ#Ḅ$ᦪ1Ḅᓽ36,ᑣ%17+24+29+33+35+38+44=220,&'—x220=88,)⌱⚗,-./88஺521.A22.B23.D24.A25.D26.Bo1'⌕3456758ᐰ:;<ᩭᨵ>?@:(1)D5;<2-58345;<3-58Ḅ5ᦪ',(2)D45;<ḄE68ᒕG3-58Ḅ5ᦪ'1,ᑣាI345;<ᐰ:58Ḅᭆ᳛'Lᓟ=^^^=LPQᫀSᨵ2,C7x6x535353x2ᓽSὃ⇋V(1),ᦑQᫀ⌱B஺27.Do1'XY”,8,ᑣ8—[,\1'xḄᨬᜧ_`a'b2,1],ᡠx+2a>828-2a=-2(a=5<8+61ᡠ(஺+Z?)""஺=1஺---=,h=-62128.A29.D30.C31.ூQᫀ௃Bo_᪆ghiYᎷkl3Y>mnḄᨵxl3o>mnḄᨵv

21p⚪r•%s!"(292+156)(x+y)=2084+1948,_x+y=9,ᓽtuᨵ9஺hioᎷkᐰuᕒElV>mnᑣw◤(292+156)ᐗYᐳ◤⌕(2084+1948)ᐗ{Ituᨵ(2084+1948)+(292+156)=9஺32.ூQᫀ௃Co_᪆g|ᐢ~⚪஺w"Yᔠ8⌕ᜫ4+12=16ᐗᎷkᐰ:ᔠ,ᑣ4x1000=4000ᐗᡠḄ3600ᐗ!4000-3600-400ᐗᡠYᐳᨵ400+16=25ᔠ8ᔠ᳛'(1000-25)-1000=97.5%஺33.ூQᫀ௃D஺_᪆ghiYkwY-ᨴḄ'1,ᑣᐰ:'180x12,4-ᨴᒕG180x(12-4)⌕D2-ᨴᑣᒕGḄ◤o12-4-2=6-ᨴᡂw-ᨴ⌕ᡂ180x(12-4)+6=240-ᓫḄᓽ◤240ᡠ⌕"240-180=60஺hio4-ᨴᒕG8-ᨴ⌕D2-ᨴQQᓽ6-ᨴᡂᑣᩭw-ᨴḄᦔ᳛'ᩭḄ2,!ᙢᦪ'ᩭḄ2,668ᡠYᐳ◤⌕180x—=240ᡠ⌕"240-180=60஺634.ூQᫀ௃Co_᪆gk“⚜m”'xᐗ“⚜m”w-mᦪ¡Ḅ¢h£y=(x-37/+(x-62/+*-61/+(x-47/+(j-49)2+(x-56)2=6x2-2x(37+62+61+47+49+56)+(372+622+612+472+492+562),᪷¥o5¦ᦪḄឋy-rb-2x(37+62+61+47+49+56).¨1ᵪr+n/A..■>»©ªx=------=---------------------------------------------=52«y¬°ᓽ⚜m'522a2x6O35.ூQᫀ¯D஺_᪆gᵬwY5±²³´µ³¶·1ᙌ1¹ª³3ᙌ«ᵬ3Y—»¼·V3+5=8ᙌᡠ³Ḅ½¾'200x?=75¿/ᑖÁ²YᑖÁᵬᙠ³D(20075)8x1=125¿஺36.91.ூQᫀ௃Bo_᪆gk6hÅḄÆÇ'1,ᑣᐸÅÉ'Io᝞Ëᡠ̹4Í┵

22ḄÏ'ÅÉ=LS//=ÐX12XL='஺ᡠoὅÅɵ'1:6஺2332637.ூQᫀ௃Ao_᪆g1'7ÓÏ.ÔᢥÓÏᔣ×⌴Ù1¹◀ÚaᨬÏḄS◤⌕Û6⌱<3᣸ᙠYÆᓽ஺¹«Ý3Ḅ᣸i᪷¥ḄÓÏ»¼Þß஺~ᳮᒕGḄ3Ḅ᣸i»¼Þß஺1¹Yᐳᨵ20>᣸i஺38.ூQᫀ௃Bo_᪆gkáᙠYâᕒḄᦈᐭ'1,Ïᦈᐭᕒᨵ20Yâᕒᨵ80஺ᑣáᙠḄåᦈᐭ'20x6+80x1=200஺åᦈᐭ"Yᑣ'200x(1+1)=400,¹«YâᕒḄåᦈᐭ'80x(1+1.5)=200,ᑣwÏᦈᐭᕒḄᦈᐭ'(400-200)+20=10,'YâᕒḄ10-(1+1.5)=4஺39.ூQᫀ௃Ao_᪆gkæ'xᐗᑣᨵ1.5x0.8x-x=24,_x=120ᡠßo'1.5x120=180ᐗ஺40.95.ூQᫀ௃A஺_᪆gp⚪r3Y-:çஹ3o-:çḄᦪᑖåᦪḄஹ411177-ᑣ3-:çᦪ'åᦪḄ1—ᡠåᦪ'28+'=48஺1¹36461212Y-:ç3o-:ç!48x(-1)=4஺4641.B42.C43.A44.D45.C46.A47.C

2348.A49.B50.D51.D_᪆:ᑭᵨìsíᐭ:1*x*2=1x-x2+21=2ᑮxoï152.C_᪆gs=+-——=122334nn+\53.CǾðᡂ1.2☢Éðᡂ1.4454.Bòóᨬ᜜õ68aYõ44ᑣᨬᑁõ'44*2-68=20஺(68-20)/2=6,ᡠᐳ6+1=7(õ)åᦪ'44x7=308,÷_gaYõᐳ44åᦪ=44ஹõᦪ44Ḅᦪøᔠ⌱⚗ᓽ55.A_᪆gᓝᦪ'1Ḅᦪᨵ15ᓝᦪ'2Ḅᦪᨵ22ஹ24ஹ25;ᓝᦪ'3Ḅᦪᨵ33ஹ36;ᓝᦪ'4Ḅᦪᨵ44ஹ48056.B÷_gᑡ?=@ᜧḄBCឋᐳGj=45EFḄBCឋᐳ=100C°CoE஺GHIᝄḄᭆ᳛M=45%60.D61.ூᫀ௃Co62.ூᫀ௃Co63.ூᫀ௃Do᪆:80*0.6*0.6*0.6=17.28%

2464.ூᫀ௃D஺᪆QR/ST1/10,U/1/8,GMVᑖWXYST1/5ᡠ[FḄQ/STM1/10+1/8-1/5=1/40ᡠ[ᵨ40ᑖW65.ூᫀ௃D஺᪆ᡃ^+FḄ_`0#ᜩᦪḄᨬcdᦪᓽ180.(36ஹ45ஹ60Ḅᨬcdᦪ)h-+ᵬjkḄ_`ᦔ᳛ᑖm#XYZ஺⚪no“ᵬjqᔠ`36ᜩYᡂ”,oᵬjᔠ`>ᜩḄᦔ᳛v#5(180+36),᪷x“jkqyᔠ`45ᜩYᡂ”ojkᔠ`>ᜩḄᦔ᳛v#4(180+45),᪷x“ᵬkqyᔠ`⌕60ᜩYᡂ”oᵬkᔠ`>ᜩḄᦔ᳛v#3(180-60bᡠ[B[ᑡX+Y=5,Y+Z=4,X+Z=3,:X=2,{v#ᵬᓫ}~Ḅ_`ᦔ᳛#2,FḄ_`0M180,ᡠ[ᵬ}~◤⌕90(180+2)ᜩYᡂ஺66.ூᫀ௃Ao᪆>✏Ⅵᣚᡂ>ᒕ0.6ᐗo>✏Ⅵ?>0.6ᐗ+ᓫMX,4X+5(X+0.6)=11.1:X=0.967.ூᫀ௃Ao᪆✌ᐜ,2ᑣᑖ6ᒕ4ᑖ3,ᑖᑮḄM0—2஺ᡠ[4B[ᑖM1ஹ1ஹ2ᨵCEᡈὅ2ஹ2ஹ0ᨵEᡠ[=6E஺68.ூᫀ௃D஺᪆ᵬH-ᨵj¡¢Ḅ6(¤ᓫᑖ᪆B,◞10ᑖ>¦§¨ᨵj¡¢Ḅ6ᙠª«)GHᵬ>¡vC¬ᑮ>ᵬ◤1-C¢ᑮj¡H-,◞10ᑖj¡®¯ᨵ>¢¦#6°ᨬ±>¢-ᵬQj¡C²#¬ᑮḄ³´µ¶ᵬ·¢-¸ᑮj¡¢¹ᩭḄ1»஺GH#6+6-1=11஺69.ூᫀ௃Boᑖmᵨa,b,c,d,e⊤½ᵬஹjஹkஹ¾ஹ¿À5yḄ_`ᦔ᳛ᑣᨵa:fe:c=6:5:4=18:15:12fᑣa:b;c:d:e=18:15:12:16:10,ᵫBᑖm+ᵬஹjஹkஹa.b'.c.d=18:15:12:16d:e=8:5=16:10

25¾ஹ¿Ḅ_`ᦔ᳛ᑖmM18t,15t,12t,16t,10t,ᵬஹkqyᔠ`15ᜩYᡂḄ_`0=(18t+12t)x15=450t¿>y}~◤⌕450t+10t=45(ᜩ)70.ூᫀ௃Bo71.ூᫀ௃Do᪆ÂÃḄÄÅ#20ÆᙊḄÈÉ#20x1.1+2=11ÆᙊÃ₝ÊḄ☢Ì#3.14X11X11=379.9=380O72.ூᫀ௃Do᪆:3584.20-3460.90+11=134.30Í஺73.ூᫀ௃C஺᪆᝞ÏÐᜐᡠᨵyÒÓ>ÔÈḄÕFÖ810ᐗ×ᓫyÓ>ÔÈḄᨴÙ◤2.5x18=45ᐗ×ᡠ[ᐳᨵ810+45=18y஺74.ூᫀ௃Co᪆᪷x[?ÚᐵÜB:Ýᙢßᙢàßáàß=30:9:25,ᡠ[Ýᙢßᨵ60yâã஺75.ூᫀ௃Do᪆(206+177+41)+2=212y஺76.ூᫀ௃Do᪆:(3.8-0.8+2.5*64%+2.4+3)+4=2.5ᐗ஺77.ூᫀ௃Bo᪆ä¹åæᔠçBâãèé⚗nḄᨵ1yâãêé⚗nḄᨵ2yâãëᵫé⚗nḄᨵ3yᡠ[âã1⚗nḄyᨵ1+2+3=6y஺78.ூᫀ௃Bo᪆+qᙢìíMS,ᨵ±+±=4,ᵨᐭñᯠᨵ203048Cóô஺79.ூᫀ௃D஺᪆᪷x⚪õᡠö÷+ᵬᓫø:>ÀᝄyᦪM6yᨵᡠ[ᵬᓫø>ÀᝄḄyᦪᓰúᓫøᝄFyᦪḄ30%஺80.ூᫀ௃Ao᪆ᵫûஹüýᱥB,1Óÿ+3ᒹᡭᓺ=362-316=46ᐗ3+9ᒹᡭᓺ=46x3=138ᐗḄᵨḄ39ᒹᡭᓺᡠḄᵨ◤362-138=224ᐗ஺81.ூ!ᫀ௃B஺ᥟ&A,B,C'()*+Ḅ,-.5x,4x,y/ᑡ125x+4x+y=520,

260.95x5x+0.9x4x+0.875y=474,34y=160,ᦑ6⌱8B9⚪;/ᵨ<ᐭ>3⚪஺o82.ூ!ᫀ௃Ao3᪆@ABᜩᒕE2+2ᡝ;=16HAIᜩᒕE16-0.5-1=31HIᐳ⌕LM31+3+O=51H஺;/ᵨ<ᐭ>3⚪Pᔜ⌱⚗!ᫀ<ᐭ/4SM2.51HTᔠ⚪Vᦑ⌱8Ao83.ூ!ᫀ௃Ao3᪆@Wᢇᵯᾯ/[28-1-80%=140\]^\]6[1320+140-85=24\ᵯᾯᦑIᐳᨵ24x140=3360\ᵯᾯ஺84.ூ!ᫀ௃C஺3᪆@AI`abcdefgh.18%xl=9%,AB`abcfg2h.9%x-1=4.5%,ᦑ6⌱8C஺285.ூ!ᫀ௃Bo3᪆@^ᳫj⌕k3lᑣAjBjஹCjஹDjᔜk1lCjAjk1lBjAjஹDjᔜk1lᦑDjko2l஺86.ூ!ᫀ௃D஺3᪆@&ᵬᦈᐭ.X,rᦈᐭ.Y,ᑣ=ty,uvᨴᦈᐭxy5433y-x=-yz{|}~ᨬᜧ9992Iᨵᨬᜧ3747ᐗ஺-8887.ூ!ᫀ௃D஺3᪆@&◀4cᨵX/ᑡ124*4+5X+2=4x5+4X,34X=2,ᑣᨵ5x4+4x2=28v஺᜜/W⚪/SvᦪI4Ḅᦪ⌱⚗ᨵ284Ḅᦪᡠ⌱D஺88.ூ!ᫀ௃Bo3᪆@ᵬro1++='|cx⍗ᑣA,Buᙢᐳᨵ6ᓝ[£3I¤1]=30ᓟH஺89.ூ!ᫀ௃Co3᪆@¦4`10§Ḅᭆ᳛.஺¤0.8ª0.2=40.96஺90.ூ!ᫀ௃Ao3᪆@6~8,9,12Ḅᨬᦪᓽ72ᜩ஺91.ூ!ᫀ௃Co3᪆@¬5®cḄM2ᵫ°±g²³ᵨo15-5+1+25%=8´µ,ᦑ¶·o15-5-8=2஺92.ூ!ᫀ௃Ao3᪆@&ᵬ¸¹Xᐗr¸¹Yᐗ/ᑡ125X+4Y=280,

274X+3Y=21934X=36,ᦑ⌱8Ao93.ூ!ᫀ௃D஺3᪆@Aº»¼½L¾o“ÀᦪcÁµᡂoÃ^»¼½LÄḄÀᦪxÅᑣIᐳL¾o஻2ÀÇ᪛ᦑ6⌱8D஺94.ூ!ᫀ௃D஺3᪆@&É2jᐳᨵxv/ᑡ1242x(10x10+20x1x)=15X+20x-x,34x=40,ᦑ6⌱8D஺295.ூ!ᫀ௃Bo3᪆@ÊᙠḄÉÌSÍÎx|°ÏᩭḄ1-30%=70%;ÊᙠḄvᦪÏᩭḄ40%x(1-40%)+40%x(1-30%)+20%x(1-20%)=68%,ᑣÊᙠḄvᙳÉÌ.ÏᩭḄ70%+68%=103%,tÒoÓ3%o

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