宁夏吴忠市2019-2020学年中考数学一模考试卷含解析

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15ூ>௃x+2-3.(x-1)(x+1)#Dg=•x+3x+2x-lx+2____xx+2(x+1)(x-l)1-7iT,'x-2>0,7mg/=2-5(2)m=2.ூ᪆௃ூᑖ᪆௃(1)ᑭᵨᑨgḄ=ᑮ(2m+3)2-4(m2+2)>1,ᯠ¡mgᓽ(2)᪷⚪xi+x2=2m+3,xix=m2+2,ᵫᩩ¤=X/+X22=31+XIX2,ᑭᵨ¥ᐰ§-¨g=(X1+X2)22-3x1X2-31=1,ᡠ2m+3)2-3(1^+2)-31=1,ᯠ¡ᐵmḄ-.ᨬ¡ᑭᵨmḄ«¬®¯ᩩ¤ḄmḄ.ூ>௃(1)᪷⚪=(2m+3)2-4(m2+2)>1,=m>-—12(2)᪷⚪Xi+X2=2m+3,XiX2=m2+2,°xiX2=m2+2>l,ᡠX12+X2=31+X1X2,2ᓽ(X]+X2)2~3X1X2-31=1,ᡠ(2m+3)2-3(m2+2)-31=1,᦮ᳮ=m,lZm-28=1,=mi=-14,m2—2,=1TOm>-—12ᡠm=2.ூab௃c⚪ὃef᪷²pᦪḄᐵp#³X௃X2CNᐗ´O-.ax?+bx+c=l(a#l)Ḅ8᪷W

16bcÖ+X,=--,Ö஽=k•ᮣÚᵨ᦮ÜᐭḄE¸<Ê.aa422.(1)y=—(2)4PḄᙶ᪗((0,4)ᡈ(0,-4).xூ᪆௃ூᑖ᪆௃(1)ÞßOA=BC=2,ày=2Üᐭy=-x+3Þßx=2,pßMḄᙶ᪗áMḄᙶ᪗ÜᐭG]^_ᦪḄ᪆âᓽyÞßvᫀ.(2)ÞßãärBMONḄ☢tÞßOPḄåᓽyÞßPḄᙶ᪗.ூ௃(1)VB(4,2),ãärOABC(qr.*.OA=BC=2.ày=2Üᐭy=-gx+33pzx=2,AM(2,2).káMḄᙶ᪗Üᐭy=—pzk=4,x4•G]^_ᦪḄ᪆â(y=?xফS¶·¸BMON=S¹¸OABC—S^AOMN^ACON=2-2x—X4=4.VAOPMḄ☢tãärBMONḄ☢t%M.".--OPAM=4.2VAM=2,.,.OP=4....4PḄᙶ᪗((0,4)ᡈ(0,-4).23.8+6ᢈூ᪆௃ூᑖ᪆௃᝞{CHJ_ABH.ᙠRtABHCÞßCHஹBH,ᙠRtAACHÞßAHஹACᓽyèé⚪ூ௃z᝞{CH_LABH.ᙠRtABCHVBC=12,NB=30°,

17•'«CH=yBC=6,BH=4BC2-CH2=673»*43CHᙠR3ACHtanA=-=——4AHAAH=8,AC=AH1+CH2=10,ூ45௃¥⚪ὃ:r┦_ᦪM0>⚪Ḅᐵë(ìíîᵨ¶·h᪀⌼rèé⚪ñὃὃ⚪ò.24.1
ó:ᦪ(100
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ᙠᡧr;<{“ᐸö”Ḅᙊù(36஺
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⊡ᐰ⚣ᦪᑖýE{þ᪆
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ᐰ᪥᰿▅Ḅ960.ூ᪆௃ூᑖ᪆௃
1ᑭᵨḄᦪ◀ᐸᡠᓰḄ$%ᓽ'()*+,-Ḅ.ᦪ/
2
ᵨ360஺1“ᐸ3”5ḄᦪᡠᓰḄ6ᑖ$ᓽ'(/
3
()“ᐸ3”5Ḅᦪஹ“89”5Ḅᦪ:⊡ᐰ<=ᓽ'/
4
ᵨ.ᦪ1᰿▅ḄᦪᡠᓰḄ6ᑖ$ᓽ'(.ூ>௃
1?ᩩA<=B)CḄᦪ20:ᡠᓰḄ$%20%,.,-ᦪ=20+20%=100
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89Ḅᦪ=100x40%=40:?ᩩA<=B)C▅Ḅᦪ30:J.“ᐸ3”5Ḅᦪ=100-40-30-20=10:ᡠᓰ$%=10+100=10%,ᙠᡧA<=B“ᐸ3”5ḄᙊIJ=360X10%=36஺/▅89ᐸ3⚗L304
M
ᐰ᪥᰿▅Ḅ3200x==960NO.ூPQ௃

18c⚪ὃefᩩ¸º»ஹᡧ¸º»Ḅhᵨ½ᩩ¸º»ஹᡧ¸º»w¾¿⌕ḄÀÁCÂÃ⚪Ḅᐵr.25.(1)0(2)------,HᫀÄN•Å⌕xÆ0ᓽx=10W--—.2x+222ூ᪆௃ூᑖ᪆௃(1)᪷ᨵᳮᦪḄ-ᑣஹÉOÊḄឋÌஹᱯÎÏḄÐÏÑᦪ
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ᯠ¡ᑖ᪷ᑖgᨵḄᩩ¤Óx=10ᐭ
ᓽ.ூ>௃#(1)Dg=1-3+d)T+i-r2=1-3+2+1-1=0x-1+lN(4_1(2)Dg=(x+l)(x-l)lx12x+2ᵫ⚪xrlx=10W,Dg:-----------2x10+21=~22'ூab௃c⚪ὃe×ᦪḄ
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Cc⚪Ḅ⚪ᐵr.26.(3)ßà᪆(3)AB=3.ூ᪆௃ூᑖ᪆௃(3)ᵫmῪâÏÐϸ=qAC=BC,CE=CD,ZACB=ZECD=90°,=qNBCD=NACE,᪷SASãqAACE^ABCDᓽ(3)1qAD=5,᪷ᐰm=qAE=BD=33,ᙠRtAAEDwᵫäåᳮ1qDEᓽ.ூ>௃ßà#(3)᝞»

19AVAACBRSECDTUῪWJXJA:AC=BC,CE=CD,VZACB=ZECD=90°,:.ZACB-ZACD=ZDCE-ZACD,:.ZBCD=ZACE,ᙠ^BCDZ4ACEB:VBC=AC,NBCD=NACE,CD=CE,/.BCD^AACE(SAS)(3)ᵫ(3)\4BCD^AACE,]^JNDBC=NEAC,AE=BD=33,VZCAD+ZDBC=90o,.•.ZEAC+ZCAD=90°,ᓽNEAD=90஺:AE=33,ED=33,.".AD=7132-122=5»AB=AD+BD=33+5=3.ூPQ௃_⚪ὃ-bᐰUXJAḄᑨdRឋf:gὃ-bUῪWJXJAḄឋfZhidᳮḄkᵨ.ὃPl3.ᐰUXJAḄᑨdRឋf/3.UῪWJXJA.27.প⊤oBp+q10,100.5,25,0.25,150.5,1(2)0.25,100(3)1000x(0.3+0.1+0.05)=450(s).ூ᪆௃ூᑖ᪆௃

20(1)ᵫ⚣ᦪWv=\wx50,ᑖwᦪᑡBp+qᑏ100.5,150.50.5-50.5Ḅ⚣ᦪ=100x0.1=10,ᵫᔜwḄ⚣᳛}ZU~1'\l100.5-150.5Ḅ⚣᳛=1-0.1-0.2-0.3-0.1-0.05=0.25,ᑣ⚣ᦪ=100x0.25=25,ᵫq⊤ᓽ'/(2)ᙠ⚣᳛ᑖWv=B:vAABCDḄ☢50x0.25=12.5,*+,-Ḅ᪵_100(3)ᐜ()ᙠ150ᐗḄḄ⚣᳛:'()k᪥1000BsC⚗..ூ>௃l(1)q⊤᝞:ᑖw⚣ᦪ⚣᳛0.5~50.5100.150.5"100.5200.2100.5~150.5250.25150.5,200.5300.3200.5~250.5100.1250.5~300.550.05ᔠ100(2)vAABCDḄ☢0.25,᪵_100(3)C*⚗Ḅᦪ=1000x(0.3+0.1+0.05)=450A.ூPQ௃_⚪ὃ-b⚣ᦪᑖ⊤:᪵_M.ஹ᪵_U\.⚣ᦪᑖ⊤B.Ḅ⚣᳛}Z1.

21