2021-2022学年江西省中考联考数学试卷含解析及点睛

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2021-2022ὃᦪᔁ
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௃'|(1)Aᵯᘤ├ᓫ.xᐗBᵯᘤ├ᓫyᐗf3x+4y=1200ᑣ¯[5x+6y=1900x--200'[|<>7=150,|Aᵯᘤ├ᓫ.200ᐗBᵯᘤ├ᓫ150ᐗe(2)Aᵯᘤa²J160a+120(50-a)<7500,75MW5a<—,2ᑣᨬ37e

15(3)CAÞᵯᘤáâaãä⚪b(200-160)a+(150-120)(50-a)>1850,&ba>35,75ånælJ350,y;x<ᜧ><ᜧ?x=l@yᨬBC18x1+73=8550(ᐗ).#?23A᪛ᩈ1'B᪛ᩈ25'@ᡠ◤FᵨᨬHC8550ᐗ.22ஹ(1)2AJKL75MBJKL25MN

16(2)?ᖪP2AJKL25M@ᖪPQᑭᨬᜧS@QᑭC1875ᐗ.ூ᪆௃U⚪ᑖ᪆#(D$ᖪPW2AJKLxMᯠY᪷*ᐵ[#ᖪP⚜]^C3500ᐗᑡ_`abc⚪N(2)$ᖪP├efgᢇKLaQᑭyᐗᯠYyixḄjᦪᐵ[ᯠY᪷*lmjᦪḄឋopqrsḄatuQᑭᨬv@Ḅ_ᫀ.U⚪᪆##(1)$ᖪPW2AJKLxMᑣBJKLC(100-x)M᪷*⚪,30x+50(100-X)=3500,x=75,ᡠx100-75=25,#W2AJKL75MBJKL25MN(2)$ᖪP├efgᢇKLaQᑭyᐗy!Jy=(45-30)x+(70-50)(100-x),=15x+2000-20x,=-5x+2000,VBJKLḄ^ᦪs{|AJKLᦪsḄ3}:.100-x<3x,Ax>25,Vk=-5<0,x=25@yᨬᜧC-5x25+2000=1875(ᐗ)#ᖪP2AJKL25MBJKL75M├efgᢇKL@QᑭᨬvS@ᑭC1875ᐗ.ὃ#1.lᐗlm_`ḄWᵨN2.lmjᦪḄWᵨ.23ஹ(1)970C95/ᑖN(2)y=35x-70(3)C60/ᑖN(4)=490N(5)ᘤ1.2ᑖᡈ2.1ᑖᡈ4.6ᑖ21.ூ᪆௃(1)?x=0@ḄyᓽCAஹBḄᵫa?=2@ᵬᑣa(ᵬ-)x@=AஹBḄN(2)ᵫ⚪,EஹFᙶ᪗ᵨu[ᦪ᪆ᓽaN(3)ᵫaᵬஹN(4)ᵫḄp@aBCḄ¡ABḄᓽCACḄN(5)ᑖ0-2ᑖ¢ஹ2-3ᑖ¢p4-7ᑖ¢£¤ὃ⇋.ூ௃

17#1ᵫ¦aAஹBḄ970ᵬᘤ§2ᑖ¢ḄC#70+60x2+2=95/ᑖN2$¤EFᡠᙠḄjᦪ᪆C#y=kx+b,Vlx
95-60=35,.,.FḄᙶ᪗C3,35,ᑣ2+=0.=3513´+´=35I==70©¤EFᡠᙠḄjᦪ᪆Cy=35x-70
3•.,¤FG஻x«ᵬஹᘤḄ¬960/ᑖN
4AஹCḄC70+60x7=490N
5$§2ᑖ¢ᘤxᑖ¢21ᵫ⚪,60x+70-95x=21,,x=1.2,§2ᑖ¢-3ᑖ¢ᘤ21@ᵫ⚪,35x-70=21,x=2.1.4ᑖ¢-7ᑖ¢GH|4,35p7,0,$¤GHᡠᙠḄjᦪ᪆C#y=kx+b,ᑣᑣGHḄ_`C®=.5x+…,ij?y=21@,x=4.6,:ᘤL2ᑖᡈ2.1ᑖᡈ4.6ᑖ21.ூ°௃

18±⚪ὃ²lmjᦪḄWᵨ³´µ9⚪ᐵ¶..24ஹ(1)&K·¸Ḅ¹C1200ᐗ&Kᵯ»¼Ḅ¹C1500ᐗN(2)ᐳᨵ5_ᫀN(3)?100VkV150@2ᵯ»¼38K·¸62KᑭᨬᜧN?016200•••[100-x<2/.33-<ᜧ.••x=38@yiᨬᜧᓽ#2ᵯ»¼38K·¸62Kᑭᨬᜧ?OVkVIOO@yi;xḄᨬᜧ>ÙB.••x=34@yiᨬᜧᓽ#2ᵯ»¼34K·¸66Kᑭᨬᜧ?k=100@¿ÀÁÂ_ᫀyiឤC20000ᐗ.

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