2023届广西贵港市数学九上期末检测试题含解析

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2022-2023
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6´CG=MN=x,´~+ABC஺!0'aE11µ!ISAHDG=_DHxx+—DGXX=SAFBE221SAHAE=-AHxx=SAGCF2SzM!+EFGH=a2-2SAHDG-2SAHAK=a2-(DH+DG+AH)xx,■:DG=a-xSzM!·EFGH=a2-(a+a-x)xx=a2-2ax+x2=(a-x)2ᦑU◤⌕⍝a-x¼½&©☢¾BE=a-x,ᦑ⌱C.ூÁ௃Ã⚪Ä⌕ὃÅ~+ḄឋÇ⚪ḄᐵÉ᪷Ë⚪´©ÌÍ⊤v©☢¾ÏM.2ஹDூᑖ᪆௃ᵫ⚪b2-4c=0,=b2=4c,Ñqᱥ9NA(m,n),B(m-8,n),½AஹBᐵ89x=-^ÒÓ,2ᡠ&A(--+4,n),B(---4,n),¤Aᙶ᪗Ôᐭy=x2+bx+c,ᓄ×᦮ᳮᓽ½ÛÜ⚪.22ூÝ௃ᵫ⚪b2-4c=0,:.b2=4c,Ñ'•qᱥ9NA(m,n),B(m-8,n),:.AஹBᐵ89x=-2ÒÓ2/.A(——+4,n),B(-------4,n),22¤Aᙶ᪗Ôᐭy=x2+bx+c,,bஹஹbஹ1,n=(——+4)2+b(——+4)+c=----b2+l+c,224

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(x-5)(2x-6)=0,!Ix-5=0ᡈ2x-6=0,x=5ᡈx=3,

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11ᦑᫀm⚪Ḅᐵa.ூᑖ᪆௃ᵨ¬ᕡ¯ᙊḄ«ᦪ◀m¯ᙊ²ᦪ³´ᓽ.ூy>௃>6•.•?ộ¯ᙊᐸ·ᨵ4«¬ᕡ¸2«¹ºᕡ42»·¼§ᔛ?«ា¿ᔛᑮ¬ᕡ¯ᙊḄᭆ᳛_6-=632ᦑᫀ?.3ூ08௃:⚪ὃ=ᭆ᳛VTḄÄᵨ᝞Å?«ÆÇᐳᨵ“LEv?«ÆÇÉḄEឋËÌᐸ·ÆÇAsÍÎLEÏÐÆÇAḄᭆ᳛P(A)=%.n913ஹ4ᡈ?4ூᑖ᪆௃᪷dËÒÓÔÕÄÖᡂØÙu>.ூy>௃>6ᑖÚLÛÜ6©VAAEF^AABC,/.AEAB=AFAC,ᓽ:¢”68ঝ•.•AEFSAACB,AAFAB=AEAC,6AF=-4-9ᦑᫀ:4ᡈ)4ூ08௃:⚪ὃ=ËÒÓÔÕḄឋÞᙠ>ß⚪à⌕ásÄḄÔ¸Ö.

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16.AEBCḄ!"YBDACḄ!".♦.FèABCḄ#$■:AB=n*.EF=-AE=43•*-BE=yjAB2-AE2=A/132-122=5%ᙠRtABEF!'BE=5,EF=44/.tanZDBC=—.5ூ()௃⚪ὃ+,-./Ḅ0ᔠ2⚪'345Ὺ-./-"ᔠ7Ḅឋ9ஹ:;<ᳮஹ┦.-.?ᦪஹ-./#$Ḅឋ9⚪Ḅᐵ.21ஹᫀB᪆ூᑖ᪆௃ᵫBE=CFBF=CE,DEᔠAB=DC,NB=NCFGABFg^DCE,2⚪F.ூ௃••,BE=CF,/.BE+EF=CF+EF,ᓽBF=CE.ᙠAABF^QADCE!'AB=DC

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18WZCFA=ZOFD,AZODF+ZCAF=90°,VOA=OD,:.ZODA=ZOAD,AZOAD+ZCAF=90°,ᓽNOAC=90஺AOA±AC,JACF஺஺ḄᑗH(2)7I஺஺Ḅ=Jr,ᑣOF=8-r,ᙠRtZ\ODF#(8-r)2+r2=(-/4O)2
K=6,rz=2(L-),ᓽOOḄ=J6(3)7VZBOD=90°,OB=OD,•••BOD争Ὺ叵2VZAOB=2ZADB=120°,:.ZAOE=60°,ᙠRQOAC#AC=V3OA=^NOP.24ஹ(-12)ூᑖ᪆௃ᵫTUV⚗Xᦪ1,ᡠ[\]^_'V⚗Xᦪ'=Ḅ`,-'V⚗Xᦪ'=Ḅ`ᓄbᓽ&cd.ூ5௃Vj=x2+6x-3=(X2+6X)+3

19=(x2+6x+32-32)-3=(x+3)2-9-3=(x+3)2-12,ᦑfᫀ7(-12).ூ?h௃i⚪k⌕ὃnoUVpᦪḄqrḄsᓄtuvwFx⚪Ḅᐵz.25ஹ(1){|}pᦪ᪆ry=3,'Vpᦪ᪆ry=x+3(2)(-6,0).xூᑖ᪆௃(1)~B?BDJ_xᚖD,ᵫB(n,-2)BD=2,ᵫtan/BOC="2/5”,POD,B?ᙶ᪗&{|}pᦪᐵXrᵫAஹB?ᙶ᪗ᙶ᪗Ḅ+PnḄᵫ“?w”PHABḄ᪆r(2)?Ex_Ḅ?⌕ABCEABCOḄ☢+◤⌕CE=COᓽ᪷HAB᪆rPCO,E?ᙶ᪗.ூ5௃7(1)~B?BD_LxᚖD,VB(n,-2),.BD=2,**8022t1nᙠRtAOBDᙠtanNBOC=——ᓽ——=-OD0D5OD=5,B?ᙠ▲,AB(-5,-2),kB(-5,-2)ᐭy=—#k=xy=10,x...{|}pᦪ᪆ry=—,XA(2,m)ᐭy=W#m=5,A(2,5),xA(2,5),B(-5,-2)ᐭy=ax+b#2஺+/?=5a=1,-5a+b=-2b=3ᑣ'Vpᦪ᪆ry=x+3(2)ᵫy=x+3C(-3,0),ᓽOC=3,VSBCE=SBCO,ACE=OC=3,AAAOE=6,BPE(-6,0).

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