四川省廣安市2019-2020八年級上學(xué)期期末數(shù)學(xué)試卷()B.D.C.?+?()22A.B.C.D.D.D.=2===()nA.B.C.3456若=，=()A.B.C.678==，④△=，==；=；=()A.B.C.C.D.D.1個2個3個4個(．B.A.222=A.B.C.D.=PA.B.C.D.5()xB.D.A.?=5=5點(diǎn)3?=5C.=5?=，=，=B2C△()A.B.C.D.4秒秒3秒秒6??=，?2?2．=2．mx中=，=于于=△△和O作交O作⊥=?；=++12點(diǎn)O△=1.(設(shè))=，=292．?+431+12=3；?+1?+1+++=，+222=．19.3+=1?9?32124+=+1?1?1220.、、、=CEBF，，=，△．21.△△，，，，；ABCy，，△，，．22.元ABAB11;AB?23.=若若=24.△=，⊥=25.△作AP=，===；=，=，==在C作AP1.C．2.C2?+?=3+?2++?，2?=，=，．3.B，選．?=．．4.A∵=，=，∴=?=3×2=．．5.C由△出=△，△△△=?{==，?∴，==，=，∴，∴△△==={,∴，，=，=∴△{△=?，?==，，=∴∵∴?=?=，∵=，，∴△，∴但∴=≠，，≠3．6.B==)(()====1)．7.C∵∴∴∴∵=⊥=，，，==，，≥，∴E．==≥E8.D==△和△=={，，．．9.Ax?=5．．x510.D?=△=?，===，=，點(diǎn)PBAQAC運(yùn)△=，=?，=?=，=．．11.××?8；×．1×0×1≤012.<n∵??=，即??=，∴?+?=?+??2??=1+=22．．13.≥且≠+=?，=+，則+2≥+2≠，≥且≠．≥且≠．xm14.和∵△=，=中是∵∴=，=，=．==，∴=?．15.=，=△+=△∵，∴∵∴∴∴=，，==，，=，=，=+++=+++=+=，即+=，=++=+8=．．16.△和，O∴∴∴=1，=1，++=，22+=?1，2=?+=+12△和，O∴∵∴∴∴∴=，=，，==，，===，，==，，+=+，即=?作O⊥于M⊥于，N△和，O∴===，∴=+=1?+1?=1?+=12222△和，O點(diǎn)△O．△和O1A△=+△2=?△O正=1設(shè)=，+=，217.=22?+=2?2．21+18.21?==+(1+?)(1+?)1+(1+?)=1，1=1=1；2當(dāng)=++1+1+++，22====++++1++++++2+，2222222++++++++，++，22221++222，當(dāng)=，=222++=4×()+4×1×+2×=．2222x與ab19.+=4，+=29=41++=4=，=x;x20.∵=，∴+=+，即∵=，，∴=，△△={==，．==、、，、21.=4×5?×1×2?×4×3?×3×5=?1?6?=，△．y，A，4×△BC，，；；22.1x1+=26，==11+=，從到÷=，AB?y+?≤，≥11+BxAxAByy23.∵、、，DE∴=，=++==+++=+=；∵∴=，=，=，∵=，∴==，∴=?=．由由、、△DE=+；=于，=，=24.∵⊥D∴∵∴∴=，=，=，=?=，=．由⊥于D==．25.∵⊥，∴∵∴∵∴∴∴∴=，=，=，=，=，?====，，．⊥于．H設(shè)∵==，==，∴===，=，√∴=1=，2∵=，∴==，∴=，==，=，∴∴∴∴===√，，==，=，=+=．=+==?+1212?+=1+，2=，+=，=．作于=⊥H=12+設(shè)∵==，==，∴=