山东省临沂市莒南县2021-2022学年八年级下学期期末考试数学试题（含答案）

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2021-2022

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7ᓽ(="*=+........................16/619.8ᑖ./8CḄ2x4ᵫ⚪7ᑡ......................1ᑖx60-x=800,......................5ᑖxi=20,X2=40..................6ᑖxi=2060-x=40X2=4060-x=2020<30,<ᔠ⚪7,>?......................7ᑖA.8cḄ2C204........................8ᑖ20.10ᑖ.•••EFḄ2GHEFḄ“ṹ”ᦪxMNOPQRᦪᐵT/Rᦪ᪆V.y=kx+b0,...................1.ᑖᵫ⚪7Wx=22y—16>x=44y—11,"16=22X+b\....................4ᑖ27=44X+8.ீ..................7ᑖb=5...Rᦪ᪆V.y=-x+5,..................8ᑖ2x=38,y=—x38+5=24(cm)...................10ᑖ221.(10ᑖ)[\8D,^/C`aO,᝞d...................1ᑖ:fgḄh213,aEஹkᑖlmh஺ஹ8CḄoaJ.AB//CD,AB=BC=CD=DA=13,EF//BD....................2ᑖ"-AC,8஺mfgḄpqrAC=24,-.ACLBD,/O=CO=12,OB=OD,..................3ᑖ7,-ABHCD,EF//BD,-.DE//BG,BD//EG....................4ᑖ,JDE//BG,BD//EG,shgBDEGmtushg....................7ᑖ-.BD=EG,..................8ᑖᙠCOZ)oVOC1OZ),C£>=13,CO=12,.,.05=<9£>=J2_2=5....................9ᑖ1312-.BD=2OD=\0,-.EG=BD=IQ..................10ᑖ

822.(12ᑖ)<=1-(1)/{|}~᪷⚪7200+—"+2)=400,ᱏ0.5.ᓽ{|}~0.5h...3ᑖ2.(400—200kᥤ2=0.5(h),ᓽ{|}~0.5h.3ᑖ(2)/y4HxḄRᦪ᪆V+4(2.5,200)ஹ(5,400)ᐭ,5k+6=400°•..................57T2.5k+6=200,....................................6ᑖAy^=80x(2.5?)ya=CD+3,.......11ᑖ-.AH=2~y=2~(6+3)=⌲C112ᑖ