2020-2021学年江苏省苏州市沭阳县某中学八年级（下）期末数学试卷（附答案详解）

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2020-2021
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6ᑣVa-2000=1996,•••a-2000=19962,a-19962=2000.ᦑ⌱A.pÂᑭᵨ>Ã᪷ᨵÄḄᩩ<$aḄÅAÇ»Rᓄ`$ᫀ.É⚪F⌕ὃIJ>Ã᪷ᨵÄḄᩩ<´µ$«ḄÅAÇ(⚪ᐵ½.8.ூᫀ௃Dூ᪆௃kᡝᑖÍÎA8ஹxÏஹyÏḄᚖ|ᚖÑᑖÍnCஹ஺ஹE,᝞Ò•••4(0,8),B(6,0),:ஹOA=8,OB=6,•AB=V824-62=10,•0ABḄ.┦dḄ᜜vᑖ|WÕÖ/P,:PE=PC,PD=PC,.PE=PC=PD,×P(t"),ᑣPC=3•••^LPAE+S&PAB+S&PBD+SØ஺~8=SPEODA-xtx(t-8)4--xl0xt-l-ixtx(t-6)4--x6x8=txt,2k722k72t=12,P(12,12),,:PាᙠÙ@³Úᦪy=2ḄÒÛÜ•fc=12x12=144.ᦑ⌱D.kPᑖÍÎABஹxÏஹyÏḄᚖ|ᚖÑᑖÍn஺ஹDஹE,᝞ÒᑭᵨᳮÝÞ$AB=10,᪷vᑖ|ḄឋPE=PC=PD,×ᑭᵨ☢àḄáâᑮtx(t—8)4-^xl0xt+|xtx(t-6)+|x6x8=txt,*$/ᑮP/ᙶ᪗ᯠ{æP/ᙶ᪗çᐭy=g*$éḄA.E⚪ὃIÙ@³ÚᦪÒÛÜ/Ḅᙶ᪗ᱯëÙ@³ÚᦪÒÛÜ/Ḅᙶ᪗ìÑᐸ᪆.íὃIJvᑖ|Ḅឋá¡z☢à.9.ூᫀ௃ூ᪆௃ᵫ⚪%2^0,xH0.᪷ᑖᨵÄḄᩩ</஺0,ïᓽ.

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8(⚪ὃ-MWᦪḄឋA`aWᦪḄb஺N.d`aWᦪe0.14.ூᫀ௃1ூ᪆௃••ᨬKgh᪷GJTTWi"^!lmgh᪷G.1+a=4-2a,B.a=1.ᦑᫀ!1.⚪P.noḄpqYᦪrl.ᑡ'YZ[.(⚪ὃ-lmgh᪷GḄᭆt.lmgh᪷G!ᓄᨬKgh᪷Gu.pqYᦪrlḄgh᪷Gvlmgh᪷G.15.ூᫀ௃m>1wm*2ூ᪆௃xᑖy.Bm—l=x,ᓽX=771—1.,••YZḄ!{ᦪ.m-1>0ᓽm>1,|}x-1*0,•••~K2.ᑣmḄ#!m>1wm%2.ᐜᐵ4xḄᑖGYZ.[BxḄ#.ᯠu?“!{ᦪ”3G[஻.Ḅ#.ᵫ4ᡃoḄḄ![mḄ#.᪷YZḄᑡ'ᐵ4."Ḅ3G.᜜.(⚪N.᧕ᣵm*2,d!}ᶍMx-10da◚Ḅᩩ⌼ᡂḄ.d2loḄ¡¢£¤.16.ூᫀ௃20஺ூ᪆௃ூᑖ᪆௃(⚪ὃ-M¥¦ḄឋA§2ᑮ¥¦¨©Ḅª«r3¬§2i¥¦¨©ᡠ®¯Ḅᜳ±34¥¦±¬¥¦²ஹuḄ³ᐰ3.µ4¨᫏⚪.ᐜᑭᵨ¥¦ḄឋABᑮ=4஺=90஺.^DAD'=a,ᑭᵨ¸¹³ᑁ±bL&'NBA஺=70஺.ᯠuᑭᵨº»L&'NDA஺
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11TUᨬV᧕>┯Ḅᙢ0.21.ூᫀ௃ᵫᦪ]^a<0,bb>0,■■a—b<0,:.+-++4(a-by=|a|-\b\+\a-b\=(—a)—b+(b—a)=la—b+b—a=-2a.ூ᪆௃mᵨop᪷Ḅᓄ+✌ᐜmtuvw0ᦪḄy@z{ᓄ+.|⚪C⌕ὃFop᪷Ḅᓄ+0H}~ᵨa>05=aa<05=-aa=05=0.22.ூᫀ௃প/=3+2e+2-2=5(2)/=V3-V6+2V2+8.ூ᪆௃(1)ᐜᑭᵨᐰ0,=ᯠ9ᓄ+9ᔠ!ᓽ<(2)ᐜ?ᯠ9ᑭᵨ᦮ᦪᢣᦪḄu=.|⚪ὃFGop᪷Ḅᔠ~=op᪷Ḅឋஹop᪷Ḅ6HHᑣ᦮ᦪᢣᦪḄuK⚪ḄᐵJ.23.ூᫀ௃¡¢;¤=0,/.%—3y=0,%2—9=0,%+3©0,x=3,y=1,ᑣᔢ2.ᡠ7oḄ?K2.y+iூ᪆௃®¯ᑭᵨ=°0᪷Ḅឋ7±?Ḅឋ²ᔠᑖᨵuḄᩩ´>X,yḄ?z¶(ᐭ·>ᫀ.A⚪C⌕ὃFG=°0᪷Ḅឋ7±?Ḅឋ¸¹>x,yḄ?K⚪ᐵJ.24.ூᫀ௃20072°ூ᪆௃(1)|p½¾¿FḄTÀÁᦪ60+30%=200(Â)ᡧÄ8ḄᙊÆÇḄÈᦪ360஺xÊ=72஺ᦑᫀ200,72°(2)4ËÁᦪ200-(40+70+60)=30(Á)⊡ᐰÍÄ᝞ÏÐ12⚓ᐳ16⚓

12(3)᪷Ó⚪u2000x^i^=1300(Â)ÔÕᕜ▅Ø5ÙLÚÛ4Ü5ḄTÀᐳᨵ1300Â.(1)ᵫ஺ËÁᦪ±ᐸᡠᓰßᑖà<áÁᦪᵨ360஺678ᡠᓰḄßᑖàᓽ<·>ᡧÄ8ḄᙊÆÇḄÈᦪ(2)᪷ÓᔜËÁᦪãäÛåÁᦪ·>4ËÁᦪæ¶⊡ᐰçÍ(3)ᵨè᪥ḄáÁᦪ67Õᕜ▅Ø5ÙLÚÛ4Ü5ḄTÀᡠᓰḄßᑖàᓽ<.|⚪ὃF⚣ᦪᑖë®0ÍஹᡧÄçÍஹᵨ᪵|Ôáí|⚪ḄᐵJKî¹⚪uᑭᵨᦪIJᔠḄïð.25.ூᫀ௃(I)ஹ•ò4ÄA8COKóÄ•••BD1AC,Z.DAO=Z.BAO,•EKAOḄôõ.-.AE=OE=-AD,2••Z.EAO=Z.AOE,:.Z.AOE=Z.BAO,OE//FG,••OG//EF,•ò4ÄOEFGK{ò4ÄvEF1.AB,AZEFG=9O°,oò4ÄOEFGKöÄফ•••ò4ÄA8CDKóÄ:.BD±AC,AB=AD=10,:.ù40஺=90°,VEKAOḄôõOE=AE=-AD=52ᵫ(1)^ò4ÄOEFGKöÄ

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