2022-2023学年吉林省长春市农安县九年级（上）期中数学试卷（含解析）

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2022-2023
ᔡ᪍ḕ᧡
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ᵫ⚪FN>(49-2x)(34-x)=960,ᦑ⌱
A.

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8•,.[ABCG[AB'C'Ḅ☢]^K49.ᦑ⌱D.᪷<=>ᣚḄឋA`ᑮ&B7/48,A'C7/AC,᪷ḄឋAf4A'B'C,AABCḄJ=᪷J=ghiḄឋA`ᑮ☢].#⚪ὃ%Ḅ'<=>ᣚḄᭆklឋA᝞nopqir'J=qist/0⚔vḄwJxyzv/0{|J}~᪵Ḅopqi<=qipv<=.10.ூ8ᫀ௃C3:VAB1BC,.B=90°.•%•AD//BC,•4=180஺z43=90஺.ᓃPAD=Z.PBC=90஺.48=8,AD=3,BC=4,.________JApB4PḄKx,ᑣBPK8—x.B{ᙠPv[PA஺GAPBCJ=}~ᑖoজAAPDsABPC,ᑣAPBP=AD)BC,ᓽ(8-x)=34,3`=ঝAAPDsaBCP,ᑣAPBC=ADBP,ᓽx4=3(8-x),3`x=2ᡈx=6.);¨©ᩩ«ḄvPḄpᦪ'3pᦑ⌱C.ᵫy“஺=PBC=90°,ᦑ⌕[24஺G4PBCJ=ᑖo¯°জ[APDFBPC,ঝ[APD-ABCP,o²!³᪷J=ghi/0{ḄJ´f2PḄᓽ!`ᑮPvḄpᦪ.#⚪µ⌕ὃ%¶J=ghiḄᑨ·ឋA¸¹〉»ᑖ¼¯°'3⚪Ḅᐵ4.11.ூ8ᫀ௃aWO3᪷¿À᪷ᨵÂḄᩩ«!`-a>0,ᡠ³a<0,ᦑ8ᫀKaSO.᪷¿À᪷ᨵÂḄᩩ«ᓽÆÇÈᦪKÉÊᦪᑡ´38ᓽ!.

9#⚪ὃ%¿À᪷ᨵÂḄᩩ«ᳮ3“ÊᦪËᨵÈ᪷”'ÍÎᑨḄÏÐ.••OO....12.ூ8ᫀ௃7....3ÑKÒ'᦮ᦪ!`Í᦮ᦪnḄᨬÖ×'7,..ᦑ8ᫀK7.郑郑..᪷¿À᪷ḄÂ38ᓽ!.............#⚪ὃ%¶/¿À᪷ḄÂḄ0ᵨØ᪷¿À᪷ḄÂ`ᐵyxḄ´'3........Ù⚪Ḅᐵ4i᝞Ú(a20)ḄÛ¿À᪷.......OO.Q..Q.13.ூ8ᫀ௃32...M!.3•.•ᨬÜ¿À᪷/eGa-yy"'༿À᪷...您.¿2b+l=7—b,CL-1=2,H)3`b=2,a=3,.-E...ᦑ8ᫀK3,2..翔...᪷ᨬÜ¿À᪷ḄÆÇÈᦪJà!`8ᫀ...氐#⚪ὃ%¶à¼¿À᪷3ä#⚪Ḅᐵ4'åÎ༿À᪷ḄÂ.OO.塘...14.ூ8ᫀ௃æ^z1t/<:0.....tti.3••ᐵyxḄzᐗ¿ÀÈèkM+2x-1=0ᨵopêᦪ᪷堞郦堞•••/=b2-4ac=4+4k20,k10,......3`kN—1í......K-Q....Q..ᦑ8ᫀK/£2-1t஺0....®....Q.✌ᐜᑭᵨ᪷Ḅᑨò[=b2-4ac=4+4k>0,᪷zᐗ¿ÀÈèḄÂ`k*0,.Q.OOoὅõᔠ`8ᫀᓽ!.....#⚪ὃ%¶zᐗ¿ÀÈèa/+bx+c=0(a*0,a,b,cKöᦪ)᪷Ḅᑨò.44>0,......ÈèᨵopJ´Ḅêᦪ᪷÷[=(),ÈèᨵopJ´Ḅêᦪ᪷÷A<0,ÈèËᨵ..êᦪ᪷.³·zᐗ¿ÀÈèḄÂ.宅氐..............15.ூ8ᫀ௃4..........3'Èè%2-4x-2=0Ḅzp᪷....OO•••m2—4m-2=0,....m2—4m=2,....N10⚓ᐳ16⚓....

10•2m2-8m=2(m2—4m)=2x2=4.ᦑ8ᫀK4.ᐜ᪷zᐗ¿ÀÈè᪷ḄÂ`ᑮzn?z4m=2,ýþ2m2z8nl>iK2(m2z4m),ᯠᑭᵨ᦮ᐭḄ.⚪ὃᐗḄᐗḄ!"ᦪḄ$%ᐗḄ.16.ூ*ᫀ௃-12/3=2715ᦑ*ᫀ68.78ᑭᵨ9:;ᐭ<=*ᫀ.>⚪?⌕ὃAᦪḄBCDEBᵨ9:;%⚪ᐵG.17.ூ*ᫀ௃6,Q஻b஻c,..M=NCBCEF.=OC2EF:.EF=6,ᦑ*ᫀ66.ᵫa஻஻/c,SᓽSWX⚪.oCDF⚪ὃ[\]ᑖ]_ᡂab:ᳮC⚪ḄᐵG%DEdᵨ[\]ᑖ]_ᡂab:ᳮ,efgὃhὃ⚪i.18.ூ*ᫀ௃6k4Ḅmᙶ᪗6-1CkCḄmᙶ᪗61,ᑣ]_4Bᐜᔣ[u2vᓫxC••kBḄmᙶ᪗61,k஺Ḅmᙶ᪗63,ᓽb=3,{ᳮCa=3,a+b=3+3=6,

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