广东省湛江市2022-2023学年数学八上期末达标检测模拟试题含解析

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2022-2023
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15¹º-•.•45=62+42=5,8C=J»+22=\,AC=+ᱏ=2".AC2+BC2=(2V5)2+(V5)2=25=AB2.ᵫµ¶ᳮḄ⌮ᳮ¢5AABC=§¨©¨ª5NAC8=90஺.ூ?@௃½⚪¾⌕ὃC☢§¨ᙶ᪗®©¨ªᙶ᪗Ḅ)*jkµ¶ᳮ⌮ᳮḄᵨ5nopq5ᓽ*⚪.25ஹ(1)জ60°ঝ4ঞ150°(2)OA2+2OB2=OC25ZODC=90°,ᳮᵫ,*᪆.ூᑖ᪆௃(1)জABOÀw\ABÁBCÂᔠ,᪷ÀwḄឋ¢NABC=Àw¨5ᵫ4ABC=J©¨ªᓽ¢>ᫀ.ঝᵫÀwḄឋ¢OB=BD,᪷Àw¨=60°¢NOBD=60஺ᓽ¹ºÄBOD=J©¨ª5]¦)ODḄÅ.ঞ᪷OD=4,OC=5,CD=3¹ºAOCD=§¨©¨ª5᪷ÇBOD=J©¨ªᓽ)NBDC9Èᦪ.(2)᪷ÀwḄឋ¢Àw¨290஺5¹º©¨ªBOD=JῪ§¨©¨ª5]¦)OD=0OB,᪷ÇOCD=§¨©¨ªᓽ¢>ᫀ.ூ,*௃(1)জ:ABC2J©¨ª5.BA=BC,ZABC=60°,'.,BAOÊ?BË┐Àw\9ᑮÇBCD,.,.ZOBD=ZABC=60°,...Àw¨ḄÈᦪ260°ঝ•..BAOÊ?BË┐Àw\9ᑮÇBCD,BO=BD,¦NOBD=60஺5.•.OBD2J©¨ª.,.OD=OB=4ঞÍÇBOD2J©¨ª5:.ZBDO=60°,VABAOÊ?BË┐Àw\9ᑮÇBCD,.CD=AO=3,ᙠÇOCD5CD=3,OD=4,OC=5,32+42=52,

16.•.CD2+OD2=OC2,.♦.OCDUåwwp?ZODC=90°,ZBDC=ZBDO+ZODC=60°+90o=150°k1(2)OA2+2OB2=OC2^,ZODC=90°.ᳮᵫ᝞æ0,.,BAOçIBè\┐êëºsᑮìBCD,/.ZOBD=ZABC=90°,BO=BD,CD=AO,/.OBDUyῪåwwp?/.OD=V2OB,îCD2+OD2=OC2\?AOCDUåwwp?ZODC=90°,/.OA2+2OB2=OC2,...îOAஹOBஹOCïðOA2+2OB2=OC2\?ZODC=90°.ூIJ௃L⚪ὃOêëḄឋr?êëñᓄóº?ÔôõöஹÔôwᑖ÷øy?kpḄᜧÐஹpúdᦋñ?®êëḄឋr~⚪ᐵ.26ஹüýþ~᪆ூ~᪆௃ÿ⚪ᑖ᪆ᐜᑭᵨḄឋᑮ᪷“ASA”AABC^DEB,ᯠ᪷ᐰḄឋᓽᑮ.⚪!᪆'AC//BE,:.NC=NDBE.ᙠ“$%&',:NC=NDBE,BC=EB,NABC=NE,:.AABCWDEB,.AB=DE.

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