贵州省毕节市2021-2022学年中考数学模拟试题（三模）含解析版

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16Xk••y=x+4y=#!AஹBx/.a+c=-4,ac=-k,:.(c-a)2=(c+a)2-4ac=16+4k,AB=2&ᵫdefᳮ[(c-a)2+[c+4-(a+4)=(2722(c-a)2=8,(c-a)2=4,/.16+4k=4,Q[k=-3,ᦑFᫀx-3.⚪ὃ¡ᦪ¢£¤¡ᦪḄ!ᡂ¦ஹ᪷§ᦪḄᐵ§ஹdefᳮஹ,¨)Ḅᙶ᪗ᱯ¬᪗⚪ᐹᨵ#fḄ?⊤ឋ°ᔠឋ±ᨵ#f²³.19.᝞,z±᪷cᐰµ¶·¸¹ºᵯ»⁚½Ḅ{ᦪ¾¿ᑴḄÁÂÃÄḄÅÆ,ᑣ·¸ூQ᪆௃17⚓/r27⚓

17ூtQ௃Ç⚪ᑖ᪆᪷c·¸Èɺᵯ»⁚½Ḅ{ᦪÊᡠᓰḄOᑖ£ᓽÍh\r{ᦪ8᪷cr{ᦪÊ·¸ÎϺᵯ»⁚½ᡠᓰḄOᑖ£h\·¸ÎϺᵯ»⁚½Ḅ{ᦪÐ#ÑᑭᵨÓÔÍh·¸"Ö×"⁚½Ḅ{ᦪ.5T10%=50({),50x30%=15({),50-5-15-20=10({).ᦑFᫀx10.ὃᩩÅÆ,8ᡧÅÆ,.20.ÜᜧᑭᦪÞßᦾáâ᜿ᙠẆåᐢçèéᡂ¦2êëᨵì᪵#îᦪ1,1,2,3,5,8,…,ï᪷cìîᦪḄðñᑏ\10ᦪ—.ூFᫀ௃55ூQ᪆௃ூᑖ᪆௃óôõöÍ[ᦾáâ᜿ᦪᑡḄðñøᦪḄÊ#ᦪоᓽÍhQ.ூtQ௃•••ᦾáâ᜿ᦪᑡḄðñøᦪḄÊ#ᦪ/.1,1,2,3,5,8,13,21,34,55,…ᦑFᫀ55.ூ௃⚪ù⌕ὃᦪᑡḄûᣚðñóôõöêëᦪᑡḄðñøᦪḄÊ#ᦪQ⚪Ḅᐵý.
.QF⚪(ᐳ7z⚪ÿᑖ80ᑖ)21.||+(7T-2017)°-2sin300+3,.2ூᫀ௃|ூ᪆௃ூᑖ᪆௃ᓄஹ0!"#ᢣᦪ!&'ᐭ30°)Ḅ+),ᦪ&ᯠ.ᢥ᯿ᨵᳮᦪḄ345"6ᑣ89ᓽ;.ூ<௃=>=@+l-2XC3233ூDE௃F⚪ὃIJKᦪḄ3&ᵨᑮḄNOD⌕ᨵஹQᢣᦪR"#ᢣᦪR&ST)Ḅ+),ᦪ&UVWᐵ6ᑣ"ឋZ[ᜐᳮ]⚪Ḅᐵ^.22.(y-z)2+(x-y)2+(z-x)2=(y+z-2x)2+(z+x-2y)2+(x+y-2z)2.b18⚓/f27⚓

18(yz+l)(zx+l)(Ay+l)^(x2+l)(/+l)(z2+l)Ḅ.ூᫀ௃1ூ᪆௃ூᑖ᪆௃ghiNj>ᓄkᑮlNmḄᐵn&'ᐭo᪗>qr.ூ<௃,**Cy-z)2+(x-y)2+(z-x)2=(y+z-2x)2+(z+x-2y)2+(x+y-2z)2.(y-z)2-(y+z-2x)2+(x-y)2-(x+y-2z)2+(z-x)2-(z+x-2y)2=0,\(y-z±y+z-2x)(y-z-y-z+2x)+(x-y+x+y-2z)(x-y-x-y+2z)+(z-x+z+x-2y)(z-x-z-x+2y)=0,2x2+2y2+2z2-2xy-2xz-2yz=07(x-y)2+(x-z)2+Cy-z)2=0.9•x,y,zᙳuKᦪ,v(x-y)2>0,(x-z)2>0,(y-z)2>0,:.(x-y)2=0,(x-z)2=0,(y-z)2=0.••x=y=z..(yz+l)(zx+l)(w+1)(x?+1)(/+l)(z?+1)"(x2+l)(/+l)(z2+l)(x2+l)(/+l)(z2+l)LூDE௃F⚪ὃIJj>Ḅᓄஹx6y>Ḅ3ᵨ&ᨵz{Ḅ|}&|D[ឤj&ᮣ3ᵨᐰy>ᓄu+#ᦪḄ"uQ[ᐵ^.23.ᙠᓅᐰᦻ&◤r30ὅ“ᦻ᪛”y¢£¤¥¦§¨&ᐸᵱ«18¬&᝕«12¬.(1)®¯°30¬±²⌱´z¬¨u“µ¶ᢞ¸”ᕒ&r⌱ᑮ᝕«Ḅᭆ᳛C(2)®“£¤¼ᑜ”¾ᙠᵬஹÀÁ¬⌱z¬&ÂÃ⚜ᜓSÆÇḄ>È{ᵫÊ&ÆÇËᑣ᝞ÍÎÏÐÑ☢ᦪÓᑖÔu2,3,4,5ḄᡫÖÑ×ᒴ.&ᦪÓÙÍÚÛÜ☢&¯´2Ð&®Ñ☢ᦪÓÝ"uᏔᦪ&ᑣᵬ&ᔲᑣÀ.àá°ÆÇyᔩãäᵨ᪛å¸ᡈᑡ⊤6▊ᳮᵫ.2ூᫀ௃(1)
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19ñzᑗ;ð8üᑭᵨᭆ᳛y>rñᦪÓÝ"uᏔᦪ"᜻ᦪḄᭆ᳛ᓽ;kñᫀ.<þ1ÿ•.•ᨵ30ὅ⚜ᜓᐸᵱ18᝕12,122•••!"30#$⌱&'(“*+ᢞ-”/0ᕒ⌱ᑮ᝕Ḅᭆ᳛('=—830592:⊤<᝞>?@2A2345@1A2(2,3)(2,4)(2,5)3(3,2)(3,4)(3,5)4(4,2)(4,3)(4,5)5(5,2)(5,3)(5,4)G☢ᦪJKLḄ'ᑗNOPQ(?5,6,7,5,1,8,6,7,9,7,8,9ᐳ12V.A1Qn...ᵬḄᭆ᳛(?P1ᑭ([ᦪ\=]=§,_Ḅᭆ᳛•(?P,ᑭ(᜻ᦜ\=b=§'12ᵫe§f:ᡠijklm.no?p⚪A⌕ὃtujkmឋiwᭆ᳛xyᵨ{|ᭆ᳛x}~ᑡ⊤<'ᑗNOPQ0⚪ᐵ.24.᝞-ᙠ஺nZᚖ(E,(8E'n91:?&ABFS/\BEC492:/஺=5,4B=8,sinD=—,4Ḅ.ூᫀ௃91:0᪆?92:2.ூ0᪆௃ூᑖ᪆௃91:ᵫm¡¢Ḅឋ£AD//BC,AD=BC,NO+/G180஺,NABF=NBEC,ᓽNP©8@20⚓/«27⚓

20(2)ᵫ¬®ᳮBE,ᵫ°±²ᦪ4E,³ᵫ´µ°±¢Ḅឋ£//Ḅ.ூ¶0௃(1)?•¡¢Z8C஺m¡¢:AB஻CD,AD//BC,AD=BC,AZ£>+ZC=180°,/ABF=/BEC,*.•Z^FB+ZJFE=180°,:/C=NAFB,:.ABFsABEC
(2)0?VJE±DC,AB"DC,%./AED=/BAE=90஺,ᙠRtAABE;,᪷¸¬®ᳮ?BE=^AE2+AB2=742+82=475,4ᙠRtLADE4E=ADsinD=5x—=4,5•:BC=AD=5,ᵫ(1)?AABFs^BEC,.AFAB••—,BCBE0?AF=2y[i.25.¹º(»¼½¾¿᜜Ḅ◤⌕Â᣸ᳫLᳫÅÆ.ÇÈᳫḄᓫÊË᣸ᳫḄᓫÊÌ30ᐗᵨ500ᐗÂḄ᣸ᳫᦪÎÏᵨ800ᐗÂḄᳫᦪÎÐ.প᣸ᳫLᳫḄᓫÊᔜÌÓᐗÔফា×ᵨØ1200ᐗᨵÙÚVÂÛÔூᫀ௃91᣸ᳫᓫÊ50ᐗᑣᳫᓫÊ80ᐗ892ᨵÝV?জÂÛ᣸ᳫ5ÆÂÛᳫ16Æ.ঝÂÛ᣸ᳫ10ÆÂÛᳫ8Æ.ூ0᪆௃ூᑖ᪆௃91à᣸ᳫᓫÊxᐗᑣᳫᓫÊx+30ᐗ᪷¸⚪áNÎᐵâ?500ᐗÂḄ᣸ᳫᦪÎ=800ᐗÂḄᳫᦪÎᵫÎᐵâNãä³0ᓽN892àា×ᵨå1200ᐗNÂÛ᣸ᳫmÆLÂÛᳫnÆ᪷¸⚪áN᣸ᳫḄᓫÊx᣸ᳫḄÆᦪm+ᳫḄᓫÊxᳫḄÆᦪn=1200,³᦮ᦪ0.@21⚓/«27⚓

21ூ¶0௃91:à᣸ᳫᓫÊ(xᐗᑣᳫᓫÊ(9x+30:ᐗᵫ⚪á?500800xx+300?x=50,èéê?x=50ëᑖxãäḄ0ᑣx+30=80.?᣸ᳫᓫÊ50ᐗᑣᳫᓫÊ80ᐗ892:ààា×ᵨå1200ᐗNÂÛ᣸ᳫmÆLÂÛᳫnÆ8ᵫ⚪á?50m+80n=1200,᦮ᳮ?m=24-1n,"."m>nð}᦮ᦪ...জn=5ñm=16,ঝn=10ñm=8?ᨵÝV?জÂÛ᣸ᳫ5ÆÂÛᳫ16Æ8ঝÂÛ᣸ᳫ10ÆÂÛᳫ8Æ.26.᝞-m¡¢ABCDiA(ᙊ÷AB(øùḄᙊúADeF,úBCeG,üýBAúᙊeE.91:EDÏ஺AÐᑗþᑨGD஺AḄᙢᐵḄ2ᙠ1ḄᩩḄGC=CD,#NC.ூ'ᫀ௃GDOA+ᑗ.ᳮᵫ/0᪆2120஺ூ0᪆௃ூ30௃ᑖ᪆5167ZG,ᵫ9Ḅ:;ᐵ<=>Nl=/2,ᯠBAZE஺gD/G஺EᑮG4G஺=90°,2ᵫ1LNG,GD᪷N9OḄ:;ᐵ0>N6,QR#>NCḄS.30515G஺஺஺+ᑗ.ᳮᵫ᝞567/G.:VGஹEᙠᙊZ%.AG=AE.•.•\]^Z8C஺`ab\]^J.AD//BC.c22⚓/e27⚓

22NB=NT,Z2=Z3.9
AB=AGf:/B=/3.AZ1=Z2.ᙠg/G஺hAE=AG

23(1)#baḄᐵgᱥ}Ḅ⚔VDᙶ᪗(ᵨaḄᦪ⊤)(2)}ᱥ}Ḅ᜜VN,#DDMNḄ☢aḄᐵ(3)a=-l¡}y=-2xᱥ}ᙠc¤¥▲§VG,VGஹHᐵ§©Vrª«¬}GH®y¯ᔣZa±tᓫ(t>0),}GHᱥ}ᨵµ¶ḄᐳV·#tḄ¸Sº.τ9273279ூ'ᫀ௃(1)b=-2a,⚔VDḄᙶ᪗(-»--a)(2)-----------a(3)2ᱥ}0᪆,ᓄ⚔V<#Eᐸ⚔VDḄᙶ᪗(2)¾VM(1,0)ᐭ}0᪆<ᐜ#EmḄSὶÄ}ᱥ}0᪆ÅÆy,Ð2,ᐜὶÄÉÊÒ<#EÓGHᱥ}Ô⌕ᐳV¡tḄSÕÍÎÓ}ÖVᙠᱥ}Z¡tḄSτ9ay=ax2+ax+b=ax2+ax-2a=a(x+¤)2"-,24.•.ᱥ}⚔VDḄᙶ᪗(4-24(2)¤•}y=2x+mVM(1,0),:.0=2x1+m,0Em=-27c24⚓/e27⚓

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252y=—x"—x+2ᵫீy=-2x-x2-x+2=-2x,0E5X]=2,X2=l,AG-1,2
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h#EGHᱥ}VgµVḄᑖèV`0⚪Ḅᐵ~ß⚪ὃlLçVwéoᔠឋwêëìwᜧ.c26⚓/e27⚓

26c27⚓/e27⚓