2020-2021学年河南省商丘市睢县八年级（下）期末数学试卷（附答案详解）

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2020-2021
ᓭḕᖪṒ
ᦪᔁ1.ᨵ20ᦟ"᪷$%&'Ḅᦪ$)ᑴᡂ᝞-ᡠ/Ḅ01-ᑣ3ᦪ$Ḅ4ᦪ567ᦪᑖ9:ᦪ76环A.7,7B.8,7.5C.8,6.5D.7,7.52.ᦪ$1,2,x,-1,-2ḄFᙳᦪ:0,ᑣ3ᦪ$ḄHI:A.1B.2C.3D.43.ᑡM'᪷N6ᨬPM'᪷N:A.VOJB.C.V6D.V274.ᡃUᓭV℉XᦪYZ[\Ḅ℉]^ᦪ_[`abcdᨵ3᪵f⍝⚪ij“lᨵmᵪfᙽᨵpqᐸ6qsb6qᓝMbᜧqᓝpbvwxᵪyz{”3⍝⚪}Ḅ:jᨵfᙽp~mᵪpᩩᑖ9x5b12b13bl3ᙽmᵪ☢ᨵᜧ{⚪6“b”:ᡃUᑴᓫ71b=500ᑣmᵪḄ☢xA.7.5FHᓟB.15FHᓟC.75FHᓟD.750FHᓟ5.᝞-p~ᱏ4BCADᢚCᙠBOḄEᜐ.8c=8,BE=2,ᑣAB?-AC?Ḅx6.᝞-ABC஺:AC=8,DB=6,OHJ.ABD¡“ᑣ¢/=/rC.12HD.24

17.¥¦§¨ᦪy=2-k
xḄ-©ª«¬Mஹ©▲ᑣ¯Ḅ°²:A.fc<-2B.fc<2C.k>-2D.k>28.ᙠF☢³~ᙶ᪗¶6f'¨ᦪy=+bm,bᙳx·ᦪ¸¥¦§¨ᦪy=x·ᦪḄ-©᝞-ᡠ/ᑣᐵ¡xḄHº=—bḄ»xA.x=3B.x=-3C.x=1D.x=-1目A苧BA.1.2B.1.5C.2.4D.2.511.-1
2=1-xᡂ¼ḄxḄ°²:.12.½wᙠDABCD6N4+NC=140஺
ᑣNBḄᦪ:஺.13.᝞-ᵫ¿À³~p~5pÀ¥HᡂḄ-.ᐸ6¿¥H☢ᑖ9:Si=22,S2=14,AC=10,ᑣAB=.¬2⚓ᐳ17⚓

251s214.ᵬÄÅp7ÆÇ5'ÈÉ▅ËÌͦÎᡂÏFᙳᑖᙳx86ᑖÐᵬÄ,ÅḄHI:x=100,Sj=110,=90,ᑣÓᢵᨬÕÖḄÆ:.15.½w:᦮ᦪÐf'¨ᦪy=(m+4)x+m+2Ḅ-©Ý«¬M©▲ᑣm=.16.Þ³ßy=2x-lᔣâFã1Àᓫ7äᔣFã2Àᓫ7ᑣFãåᡠæ³ßḄ»᪆Nx.17.5À¥᦮ᦪ67ᦪ:4,èfḄ4ᦪ:6,ᑣ35Àᦪ5Ḅᨬᜧx.18.᝞-éê488Ḅ☢x12FHᐸ6ë~ßACìíḄîx4ᑣë~ßBOìíḄîx.19.᝞-f'¨ᦪy=-x-2¸y=2x+TnḄ-©ñò¡P(n,—4),ᑣᐵ¡xḄÝõN-2Ḅ»öx.20.᝞-÷øABCD6AB=2,AD=1,ExCD6ùxABfú(ûü)FxCP6ᑣøCEFḄᕜᨬx.21.(1)ᐜᓄ
+ᐸ஺=41(2)a-b=2+V3,b-c=2—yp3,a?+f)2+c2-ah—he—acḄ.22.ᔆ!!"#$ᙠᓫ'()ᑁ+#,-./Ḅᢈ1234567!50:#$+#Ḅ./;<=>?@ABCᔜE+#ḄᔠGHᦪJ1ᑮ8MNO᦮ᦪ.Q

3RS?@TḄUᑖWX᝞ZT["\Zᑡ^⚪(1)᪷a?@TM50:#$+#AḄᔠGHᦪḄ'ᦪ;(2)ᑏAM50:#$+#ᔠGHᦪḄdᦪḄe17.23.᝞TghiABC஺mEᙠoA8pqo4஺ᢚstmAាvwᙠo8CpḄmFᜐᢚzDE.|AB=4,BF=2,AEஹOEḄg.24.᝞T஺m4(0,4),m஺(4,0),Gy=gx+1xmC,%mB.(1)1Ḅᦪᐵ(2)mBḄᙶ᪗(3)ABCḄ☢.25.ᵬஹ$ᒴ,ᙢmᑮ1500ᜐḄT✂ᵬA¡5ᑖ¢£¤50/ᑖḄ¦§,¨<©.ªᵬஹ$«s()ᵬ<©Ḅ()t(ᑖ)sᐵfḄᦪT®ḄUᑖ᝞Tᡠ°.(1)ᵬ<©Ḅ¦(2)ᙠᙶ᪗⊡²sᐵ/ḄᦪT®Ḅᐸ³Uᑖ(3)^ᵬஹ$´(«360¶·4⚓ᐳ17⚓

4@450r...........7300[/0;55Q#ᑖ26.᝞Tº»¼hiA8C7)Ḅ½¾AC8஺mO,mEஹ¿ᑖÀJ஺8ஹOCpḄÁm.(1)᝞ÂÁmEஹ¿ÃÄBE=CÅজᑏAᡠᨵ¤mEᡈF⚔mḄᐰË̾i(ÍÎÏ+ÐÑ)ঝÓÔAE1BF.(2)᝞ÂÁmEஹFÃÄBE=OF,^AE1BF(m£ᙠÖ×'ØÙÓÔÚḄÛÜ.

5\ᫀÞ"᪆1.ூ\ᫀ௃Dூ"᪆௃ூᑖ᪆௃â⚪ãäẠ⚪ὃç!èéêᦪaḄ'ᦪÞdᦪḄ1ë.ìíî'ᦪḄ(᎛é⌕ᐜ᣸vóôᯠ£᪷a᜻ᦪÞᏔᦪOᩭèé'ᦪ᝞Âᦪaᨵ᜻ᦪOᑣ¼)Ḅᦪúᓽᡠ.᝞ÂJᏔᦪOᑣî)'ᦪḄ3ᙳᦪ.dᦪeᵫᩩi?@T$ᦪᨬḄᦪᑏᦪᢥᑮᜧḄ᣸ᑡḄᡠ⌕ᨬḄᦪ(ᡈᨬḄ"ᦪḄ#ᙳᦪ)ᓽ'(⚪ᨬḄ"ᦪḄ#ᙳᦪ.ூ,-௃,/ᵫᩩ2345ᦪᨬḄᦪ6ᙠ89:7ᦑ=ᦪ7()>ᢥᑮᜧḄ᣸ᑡḄᨬḄ"ᦪᓽ810ஹ11ᦪ67()ஹ8()ᦑᦪ7.5().ᦑ⌱/D.2.ூ-ᫀ௃Bூ,᪆௃ூᑖ᪆௃(⚪ὃKLMḄNO:QᙢS஻ᦪ6,V,W…%Ḅ#ᙳᦪZᯅᑣLM52=>[(%-x)2+(x-x)2+-+(x-x)2],de᧜g:ᦪ6ḄhiᜧLMjᜧhiឋj2nᜧelmᡂo.ᐜᵫ#ᙳᦪḄqr4sXḄuv᪷6LMḄqr4s.ூ,-௃,/l+2+x-1-2=0,,yx=o,LM52=|[(1-0)2+(2-0)2+(0-0)2+(-1-0)2+(-2-0)2]S2=2.ᦑ⌱B.3.ூ-ᫀ௃Cூ,᪆௃,/Aஹr=ᦑAWᨬ᪷r.Bஹr=?,ᦑBWᨬ᪷r.Cஹᨬ᪷rᦑCᨬ᪷r.஺ஹr=36ᦑ஺Wᨬ᪷r.ᦑ⌱/C.᪷6ᨬ᪷rḄNOᓽ'-ᫀ.86⚓ᐳ17⚓

6(⚪ὃK᪷r,⚪Ḅᐵᳮ,ᨬ᪷rḄNO(⚪Ạ⚪.4.ூ-ᫀ௃Aூ,᪆௃,/v52+122=132,•••9ᩩᑖZ51213᪀ᡂg92ᙽᵪ☢¢Z/|x5x500x12x500=7500000(#L£)=7.5(#Lᓟ£).ᦑ⌱/A.ᑭᵨ§¨NᳮḄ⌮Nᳮª«¬ᔠ92☢¢®y-ᫀ.¯⚪°⌕ὃKg§¨NᳮḄ±ᵨy92Ḅ2²,⚪ᐵ.5.ூ-ᫀ௃Dூ,᪆௃,/•.³92´ᱏABC¶4஺ᢚ¸¹ºC»ᙠ8¼½ḄºEᜐ•AE=AC,DE=CD,AD±BC,•AB2=AD2+BD?,AC2=AD2+CD2,AB2-AC2=AD2+BD2-AD2-CD2=BD2-CD2=(BD+CD)(BD-CD)=BC-BE,BC=8,BE=2,AB2-AC2=8x2=16.ᦑ⌱/D.᪷6ᢚ¸Ḅឋ¿yᑮ4E=AC,DE=CD,AD1BC,ᵫ§¨Nᳮyᑮ=AD2+BD2,AC2=AD2+CD2,"rÀÁÂÃ᦮rḄᓄᓽ'yᑮ¬Æ.(⚪ὃKgÇᢚÈᣚ-ᢚ¸Ê⚪§¨Nᳮ᦮rḄᓄËÌÍÎᢚ¸Ḅឋ¿,⚪Ḅᐵ.6.ூ-ᫀ௃Aூ,᪆௃,/᝞SÐÑÀÒºO,•••AC——8.DB—6,•••AO=-AC=-x8=4,22BO=-BD=3x6=3,22ᵫ§¨NᳮyAB=Ó஺2+8஺2=V424-32=5,••DHLAB,'S$%ABCD=AB‘DH=^AC-BD,ᓽ50H=jx8x6,,y஺H=y.ᦑ⌱/A.SÐÑÀÒº஺᪷6Ô2ḄÐÑÕÀᚖ#ᑖA஺ஹBO,vᑭᵨ§¨Nᳮ

7ᑡrA8,ᯠØ᪷6Ô2Ḅ☢¢ÐÑÙ¢ḄÚÛÜÙÝᑡLÞ,ᓽ'.(⚪ὃKgÔ2Ḅឋ¿§¨Nᳮ°⌕ᑭᵨgÔ2ḄÐÑÕÀᚖ#ᑖḄឋ¿ߺᙠᑭᵨÔ2Ḅ☢¢Ḅ"à⊤âL®ᑡLÞ.7.ூ-ᫀ௃Dூ,᪆௃,/.ãäåᦪy=(2—k)xḄæçÃ8ஹÓæ▲***2—k<0,,y/k>2,ᦑ⌱/D.᪷6ãäåᦪḄឋ¿Ûéêyᐵ½ḄWrWrḄ,ëᓽ'.(⚪ὃKḄãäåᦪḄæìíᦪḄᐵíËêãäåᦪî=kx(k¼0)ïk<0ðåᦪḄæᙠஹÓæ▲,-¯⚪Ḅᐵ.8.ூ-ᫀ௃Aூ,᪆௃,/•.•"ᩩÑḄÒºᙶ᪗Z(3,-1),ᐵxḄLÞmx=nx—bḄ,Zx=3,ᦑ⌱/A.ᵫæ'ê⍝ïx=3ð"åᦪḄåᦪuÀḄ.(⚪ὃKgåᦪìᐗLÞ/LÞḄ,õ"åᦪæḄÒºḄöᙶ᪗.9.ூ-ᫀ௃Bூ,᪆௃,/<•1BF=2FC,•••SFC=x,ᑣ8F=2x,•••BC~3x,•••Ó2ABCQ÷2•••BC=AD=3x,ZB=90°,•••³AACE¶ÑAEÇᢚyøSAFE,ùºF»ᙠBC½:.AD=AF=3x,••AB=y/AF2—BF2-y/9x2—4x2—V5x,ABy/5xV5——«BC3x3ᦑ⌱/B.ᵫᢚ¸Ḅឋ¿'y4D=Aú=3x,ᵫ§¨Nᳮ'ABḄᓽ',.(⚪ὃKgÇᢚÈᣚ÷2Ḅឋ¿§¨NᳮÍÎᢚ¸Ḅឋ¿(⚪Ḅᐵ.10.ூ-ᫀ௃A88⚓ᐳ17⚓

8ூ,᪆௃,/ûCM,᝞ᡠâ/Av/-ACB=90°,AC=3,BC=4,2222AAB=yjAC+FC=V34-4=5,•••MEJ.4C,MFBC,/-ACB=90°,.Ó2CEMb÷2•EF=CM,•ºü£üḄºCP=-EF,2ïCM_L4BðCMᨬþ,¯ðEFmᨬᑣCPᨬ,•4BCḄ☢¢="BXCM="CXBC,ACxBC3x4.•CM=------(-----=2.4,ABCP=\EF=\CM=1.2,ᦑ⌱/4ᐜᵫ§¨Nᳮ=5,vÿ
CEMEF=CM,CM14BCMᨬEFᨬᑣCPᨬᯠᵫ☢CM=2.4,ᓽᫀ.⚪ὃ!"Ḅᑨ%&ឋ(ஹ*+%ᳮஹ☢-.ᨬ/01234567Ḅᑨ%&ឋ(8⚪Ḅᐵ:.11.ூᫀ௃x<1>8᪆௃8@-1)2=|x-1|>A|X-1|=1—X,AX—1<0,ᓽA<1.ᦑᫀDA<1.᪷FG=|a|ᑮJ(x-1)2=|x-l|,ᑣᨵI*-1|=1-x,᪷FKL/ḄMNᓽᑮxḄO/Q.⚪ὃ!"RS᪷TḄឋ(&ᓄV@=|a|.12.ூᫀ௃110ூ8᪆௃8@•••XY
ABCD,••Z.A+Z-B=180°,Z.A=zC,•4/+4஺=140°,:.Z-A=Z.C=70°,B=110°,ᦑᫀD110.

9᪷FXY
Ḅឋ(L[0-.\]⊡ᓽᫀ.⚪_⌕ὃ!"XY
Ḅឋ(ᮣbḄcᵨXY
Ḅឋ(8ef⚪Ḅᐵ:.13.ூᫀ௃8ூ8᪆௃8@,•,Si=22,S=14,2:‘S3=S1+$2=22+14=36,•••BC=A/36=6,vAC=10,AB=y]AC2-BC2=V102-62=8,ᦑᫀD@8.᪷Fxyz{Ḅ☢|0}S3,ᯠ᪷F*+%ᳮᓽᑮ~.⚪ὃ!"*+%ᳮz{Ḅ☢4567*+%ᳮᓽᑮ~.14.ூᫀ௃ூ8᪆௃8@••<%=100,S3=110,=90,"SD0+2<0'8—4

108@º»¼y=2x-1ᔣ¾X¿1yᓫÁÂÃᑮy=2
x+l-l=2x+l,ÄᔣÅX¿2yᓫÁÂÃᑮy=2x+3.ᦑᫀD@y=2x+3.»ÆᑭᵨSᦪḄX¿ÇÈɤᫀ.⚪_⌕ὃ!"Sᦪ&ÊËÌᣚzÎ67X¿ÇÈ8⚪ᐵ:.17.ூᫀ௃21ூ8᪆௃ூᑖ᪆௃⚪_⌕ὃ!"᪷FµᦪFḄÐÁᦪ|ÑᦪᩭÎ%ᦪFḄÓÔ.ÕµᦪFÖᑮᜧØᡈÖᜧᑮÙÚÛ᣸ᑡᨬÐÝḄÞyᦪØᨬÐÝxyᦪḄXᙳᦪÙßàáµᦪFḄÐÁᦪ.âM@ãÐÁᦪḄ᎛%⌕ᐜ᣸åæçᯠÄ᪷F᜻ᦪ|ᏔᦪyᩭÎ%ÐÁᦪ᝞ëᦪFᨵ᜻ᦪyᑣzÐÝḄᦪìᓽDᡠ᝞ëᏔᦪyᑣãÐÝxÁᦪḄXᙳᦪᓽDᡠ.᪷FÐÁᦪ|ÑᦪḄ%Nᑖ᪆ᫀ.ூ8௃8@îDïyz᦮ᦪÖᑮᜧ᣸ᑡᐸÐÁᦪ4,áµᦪFḄðÑᦪ6,ᡠ-á5yᦪFᑖñx,y,4,6,6,ᐸÐx=lᡈ2,y=2ᡈ3.ᡠ-á5yᦪḄ|Ḅᨬᜧ/2+3+4+6+6=21.ᦑᫀD@21.18.ூᫀ௃6ூ8᪆௃8@᝞òÆ4CஹBD.S$%ABCD=N*AC,BD,AC-4.AIx4xeo=12,RBD=6,ᦑᫀD6᪷FóḄ☢ôTᑮ3xACXBD=12,ᓽ8ef⚪3⚪ὃ!óḄឋ(8⚪Ḅᐵ:ᳮ8⚪MõöóḄ☢0}L¼÷Ḅø.19.ூᫀ௃-2cx<2

11ூ8᪆௃8@•••Sᦪy=-x-2ḄùP(n,—4),•••—4=-n—2,8n=2,,,:y=-x-2&xüḄýù(-2,0),Rᐵ}xḄ0T2x+m<-x-2<0Ḅ8þD-2?@4ᦪABᔠḄDEF>GHHI஻Ḅ>KLM0⚪ḄᐵO.20.ூMᫀ௃V2+1ூL᪆௃LW:EZCO]>^ZCP]>EF=-PD,2:.“EF=CE+CF+EF=CE+^(CP+PO)=1(CD+PC+PZ))=-C)hCDP.•.bcCDPḄᕜeᨬgh>ACEFḄᕜeᨬgkᓽPC+PDḄᨬgh>cCE^Ḅᕜeᨬgk᝞m>n஺ᐵpA8Ḅ&rD',tuCD'vABpP,•4AD=AD'=BC,AD'//BC,•••xyAAD'BCKz{xyA>AP=PB=1,PD'=PC,CP=PD=y/2,C&CEF~3C4CDP~V2+1,ᦑMᫀZWV2+1.᪷~AḄ]ḄឋᑮEF=ᑮ஻CEF=CE+CF+EF=CE+|(CP+PD)=j(CD+PC+PD)=ic,bACDPḄᕜeᨬgh>ACEFḄᕜeᨬACDPgWᓽPC+PDḄᨬgh>aCEFḄᕜeᨬgk᝞m>n஺ᐵpA8Ḅ&rD',tuC஺'vABpP,pKᑮB.0⚪ὃ34#&r-ᨬ⚪>AḄᕜeḄ>HḄnmAKL⚪ḄᐵO.21.ூMᫀ௃Lk(1)==ᓃ+a+2(a+l)(a-l)3aa—1_____________x_____(a+l)(a—1)a12⚓>ᐳ17⚓

123=,a+1b஺=51h>===(2)Q—b=2+V3,b—c=2—V3,Aa—c=4,.=_a2-2ab+b2+b2-2bc+c2+a2-2ac+c2_(a-bY+(b—c)2+(Q—c)2¡2_(24-V3)24-(2-V3)2+42=2_14+16=~2-=15.ூL᪆௃(1)ᐜ¥{ᑖ=¦ᔠ>.(2)&=᦮?ᣚ©.0⚪ὃ3ᑖ=¦ᔠª«¬ᐰz®=Ḅ'ᵨ>HIᑖ=¦ᔠª°±«H²KL0⚪Ḅᐵ³.22.ூMᫀ௃LW(1)ஹ•µᔠ¶·ᦪ¸gᑮᜧ᣸ᑡ>25,26¼ᦪ"Z4,¡]ᦪZ4k(2)½ᦪ⌕¿ᒕÁḄ18Â/Ãᙠᔠ¶·ᦪḄÄ5Å>ᨵÇÈÉ/ÃWজᔠ¶·ᦪK5ஹ6ḄᙳZ9Â>ᑣᔠ¶·ᦪḄ½ᦪZ4kঝᔠ¶·ᦪK5Ḅᨵ10Â>ᔠ¶·ᦪK6Ḅᨵ8Â>ᑣᔠ¶·ᦪḄ½ᦪZ4Ï5kঞᔠ¶·ᦪK5Ḅᨵ8Â>ᔠ¶·ᦪK6Ḅᨵ10Â>ᑣᔠ¶·ᦪḄ½ᦪZ4Ï6kটᔠ¶·ᦪK5ḄÒÓ10Â>ᔠ¶·ᦪK6Ḅ;Ô8Â>ᑣᔠ¶·ᦪḄ½ᦪZ5kঠᔠ¶·ᦪK5Ḅ;Ô8Â>ᔠ¶·ᦪK6ḄÒÓ10Â>ᑣᔠ¶·ᦪḄ½ᦪZ6.Ö×ᡠÙ>ᔠ¶·ᦪḄ½ᦪ/ÃZ4k5k6k4Ï5k4Ï6.ூL᪆௃(1)ᔠ¶·ᦪ¸gᑮᜧ᣸ᑡ>25926¼ᦪ>zᙳᦪᓽ/]ᦪk(2)᪷~½ᦪḄIÚLMᓽ/.Û⚪ὃ34ᩩAÝm>]ᦪ>Ç«½ᦪ>Þß]ᦪϽᦪḄIÚKL0⚪ḄᐵO.23.ூMᫀ௃LWàAE=x,^\BE=AB-AE=4-x,•••ᢚâ©AាäᙠyBCḄ^ᜐ>•••EF=AE—x,ᙠ]>ᵫçèIᳮ>BE2+BF2=EF2,ᓽ(4-ê/+22=X2,Lx=|,

13ᓽAEḄeZI>à/஺=m,ᑣDF=BC=m,:FC=m—2,ᙠRtZkFOC]>DF2=FC2+CD2,ᓽ=(-2)2+42,7nL>m=5,DE=yjAE2+AD2=J(|)2+52=ô.ூL᪆௃à4E=x,⊤ö8E,᪷~÷ᢚ)ᣚḄឋ/EF=4E,ᯠ©ᑭᵨçèIᳮᑡúAE,àAD=m,ûü4EḄF/QEḄe.0⚪ὃ34÷ᢚ)ᣚḄឋ>çèIᳮ>Ûû⚪þÞßឋÿᑭᵨᳮᑡ⚪Ḅᐵ.24.ூᫀ௃(1)1Ḅᦪᐵ!"=/£'+)*஽=—1,ᡠ/Ay=-%+44y=—x+45*6:;ᡠ/B(2,2)4(3);y=0,1+1=0*x=—2,ᑣC(-2,0),SAABCḄ☢;=SPCDḄ☢;~SZBCDḄ☢;=-x6x4--x6x2=6.ூ᪆௃(1)kḄᦪᐵ!"=kx+b,ᑭᵨDᦪEFAஹ஺IJᙶ᪗Mᐭ"=kx+bOP*ᐵQR6ḄSᓽP4(2)ὶVᓃX%Ḅ᪆Yᡂ[ᐗ]^YSYᓽP*ᑮBJᙶ᪗4(3)✌ᐜbcCJᙶ᪗S4ABCḄ☢;=S—COf╃—SABCDhi?klbcᓽP•n⚪o⌕ὃrsItuvwXxly⚪ᐵz{|IᦪwJ}ὶVI~ᦪ᪆xஹyḄᓽP*ᑮwJᙶ᪗.25.ூᫀ௃(1)ᵬlḄ150+5=30(/ᑖ)4(2);t=35ᵬlḄ!30x35=1050()lḄ!(35-5)X14⚓ᐳ17⚓

1450=1500.•.;t=35ᑮ✂ᵬ✂Ḅᨵ1500-1050
=450,•••ᵬᑮ✂◤4450-30=15ᑖ35+15=50ᑖ.•.;s=0)Ḅ!50.⊡Ḅ¡᝞ᡠ£¤)Ḅ!50
,¥¦xᑖXᵬ]^v⍗᪷©⚪ª*150+30x=50x,*«=7.5,7.5+5=12.5ᑖᵫᦪ¡P;t=12.5s=0,•••JBḄᙶ᪗!1250
,;12.5WtW35BCḄ᪆!s=kt+b,¤®¯0
,FC35,450
,812.5,0
MᐭP*:°±;ᓃ**³´•s=20t—250,;35Vts50C஺Ḅ᪆!s=kix+bµ¤¶M0
,F050,0
,/35,450
Mᐭ*·¸*.¹1=-3°º».ᓃ=1500s——30t+1500,•••ᵬஹI¼v3v,ᓽs=360,*ᓃ=30.5,t=38,2[;ᵬl30.5ᑖ½ᡈ38ᑖ½ᵬஹI¼v360.

15ூ᪆௃¤1ᵫ¡Pt=5s=150᪷©=+ᓽP4
2᪷©¡¿ÀḄÁÂP;t=35ᑮ✂ᵬ✂Ḅᨵ
1500—1050=450ᵬᑮ✂◤4450+30=15
ᑖᡠ/35+15=50
ᑖᡠ/;s=0)Ḅ!50.বᑖÄ|;12.5WtW35X;35

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