2021-2022学年江苏省镇江句容市中考联考数学试题含解析及点睛

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௃(1)ᵫ⚪w_k=xy=2x3=6.xVWXYᦪḄF᪆[y=9x(2)yBᙶ᪗(a,b),᝞`ADLBC5D,ᑣD(2,b),,6AD=3----9a116••SAABC——BC*AD=—a(3)=6,22aF_a=6,AB(6,1),yABḄF᪆[y=kx+b,zA(2,3),B(6,1)TᐭYᦪF᪆[_2k+b=3k=-F_2,6k+b=lb=4ᡠ1ABḄF᪆[y=-gx+l.

18ூ|௃"⚪ὃ%&ᑭᵨs;tᦪu^VWXYᦪ=6~YᦪF᪆[s;tᦪu=⊤deBC,ADḄLF⚪ḄᐵO.1322ஹ(1)ABḄF᪆[Ly=3x+l.B(3,0).ফ^n-l(3)(3,4)ᡈ(5,2)ᡈ(3,2).ூF᪆௃⚪ᑖ᪆(1)QAḄᙶ᪗Tᐭ1ABḄF᪆[ᓽ]^_bḄoᯠgᙠF᪆[y=0,^_xḄoᓽ]^_BḄᙶ᪗!(2)A`AMJ_PD,ᚖM,^_AMḄᓽ]^_BPDPABḄ☢ixὅḄᓽ]^_!3(3)SAABP=2-11-1=2,F_n=2,ᑣNOBP=45஺ᯠgᑖAஹBஹPᑖL1,⚔^F.2⚪F᪆(1)y=-x+bA(0,1),.".b=Lx1ABḄF᪆[Ly=-gx+1.y=00=-gx+LF_x=3,.,.B(3,0).(2)A`AMJ_PD,ᚖM,ᑣᨵAM=LPD=n-—SAAPI>=—PD*AM=—xlx(n--)=—n--322323ᵫB(3,0),]Bᑮ1x=lḄ2,ᓽBDPḄ3PDḄ2,.12••SABPDx—PDx2=n--,23.1123/•SAPAB=SAAPD+SABPD=-n--+n-6=x-n-123323,(3)SAABP=2-n-l=2,F_n=2,2

19.,.P(1,2).VE(1,0),.♦.PE=BE=2,NEPB=NEBP=45஺.1᝞1,ZCPB=90°,BP=PC,ZC¨CNJ_¡x=lON.VZCPB=90°,NEPB=45°,
ZNPC=ZEPB=45°.XVZCNP=ZPEB=90°,BP=PC,/.CNP^ABEP,PN=NC=EB=PE=2,.♦.NE=NP+PE=2+2=4,AC(3,4).2᝞2NPBC=90஺BP=BC,ZC¨CFJ_x©OF.VZPBC=90°,ZEBP=45°,:.ZCBF=ZPBE=45°.XVZCFB=ZPEB=90°,BC=BP,/.CBF^APBE.BF=CF=PE=EB=2,.♦.OF=OB+BF=3+2=5,

20AC(5,2).3᝞3,ZPCB=90°,CP=EB,:.NCPB=NEBP=45°,ᙠAª©8e4PEB8,CP=EB{ZCPB=ZEBPBP=BP/.PCB^APEB(SAS),PC=CB=PE=EB=2,AC(3,2).aPB6ᙠ¬▲¨gῪ¡nRn5BPC,CḄᙶ᪗(3,4)ᡈ(5,2)ᡈ(3,2).ὃ3±²ᦪ£ᔠ⚪.23ஹ´⚪1AஹBµ¶·!¸Ḅᓫºᑖ»70ᐗe80ᐗP´⚪2aḄ:61ூ᪆௃´⚪1½A¶¸Ḅᡂᓫº6xᐗᑣB¶¸Ḅᡂᓫº6(x+10)ᐗ¾⚪¿c50x+50(x+10)=7500,cx=70,.,.x+10=80,S3AஹBµ¶·!¸Ḅᓫºᑖ»70ᐗe80ᐗP150012஺°´⚪2ᵫ⚪1c----X1000+8<7+240x1000=10000,aaca=l,ÁÂÃ3a=lᑖÄ[ḄᦑaḄ:61.124ஹ—12ூ᪆௃

21ax+by=?)Ä[Æg2),᪷Èᩩ`(9,ஹbḄÊ,hi(9ËÌÍᩩ`ḄjÎᦪᑭᵨÐᐺᭆ᳛Ḅᭆ᳛ÔbÕÄ[Æ]ᨵḄᭆ᳛.ூ2௃\cix-\-hy=?)x+2y-2'28-6x=-------->0b-2ac3-2a<0b-2ah>3×b>2a,<3a>—I2ᓽa=2,3,4,5,6b=4,5,6Øᔠᩩ`ḄᦪÆᨵ(2,5)(2,6)ᐳᨵ2b<3×b<2a,<3a<—I2Øᔠᩩ`ḄᦪÆᨵ(1,1)ᐳᨵ1ᭆ᳛pÙÚᦑSᫀ63—.12ூ௃⚪Ü⌕ὃCÐᐺᭆ᳛Ýᐸᭆ᳛,#ÔḄÞᵨ.