2021-2022学年浙江省九年级（上）第二次返校考数学试卷（附答案详解）

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2021-2022
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2ᑭᵨᦪ[dᔠḄfg$ij⚪ᓽ4.F⚪ὃIkX■mᵨno-kXab[Ḅ☢qrs$⚪ḄᐵuNvwᑭᵨᦪ[dᔠḄfg$ij⚪x7ὃyὃ⚪z.21.ூQᫀ௃$U(1)kDM{|M,•~4(2,0),~B(0,a)(a>0),•OA=2,OB=Q,•YZ[A8CQNO/[•BAD=90°,BA=ADf/B40+4ZMM=90°,484஺+48஺=90°,DAM=(ABO,ᙠ/஺8MDM47/.DAM=/.ABOAOB="MA,BA=AD.•408YOMAQW),•DM=04=2,AM=BO=a,•OM=2+a,:.D(24-a,a)(2)kCF_Ly|EN_Lx|N,ᳮ40BgZkBFC(44S),•BF=OA=2,CF=BO=a,:.C(a,a4-2),DM஻EN,~஺AEḄ7~MNANḄ7~EN=2DM=%••AN=2a,16⚓ᐳ22⚓

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17FH=AD=2,᪷*ÑÒᳮᓽ4ᑮd×.23.ூQᫀ௃20ூ$᪆௃$U(1)জ4+4x2+(880-20x4-40x4x2)4-60=4+4x2+(880-80-320)+60=4+4x2+480+60=4+8+8=20(Ú)••.Ûᓫ8^ᐳÝ¿20ÚÞᐝà.ᦑQᫀU20.ঝoÝâãÚAzÞᐝàÝäåwᐗᑣÝâÚ8zÞᐝà(20-m-2m)ÚCzÞᐝàè⚪KUw=20m+40x2m+60(20—m—2m)=-80m+1200.v20-m-2m>0,.20•.mJérm,2m,(20-m-2m)ᙳêᯠᦪm<6,-80<0,wìmḄíᜧîïð.•.m=6wñᨬð¥ᨬð¥=-80x6+1200=720,ÝäåᨬóḄ/ᫀUÝâ6ÚAzÞᐝà12Ú8zÞᐝà2ÚCzÞᐝàḄÝäå720ᐗ.(2)oÝâxÚAzÞᐝàyÚCzÞᐝàᑣÝâ᱐Ú8zÞᐝàè⚪KU20x+40x2x+60y=2080,104-5%y=-3-éõx,yᙳO᦮ᦪ(x=1_^(x=4_p,fx=70,(%=10-(%=13_^(x=16-(%=19•••|y=33ᡈ1=28ᡈy=23ᡈ1=18ᡈø=13ᡈ1=8ᡈ1y=3.n=x+2x+y=3x+y=36ᡈ40ᡈ44ᡈ48ᡈ52ᡈ56ᡈ60,ùúḄᨬᜧ¥60.QUᨬ=Ý60Ú.(1)জüÝᵨḄaýzþḄÞᐝàᦪÿ
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