2020-2021学年广东省佛山市顺德区九年级（上）月考数学试卷（10月份）（附答案详解）

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2020-2021
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13DF=-CD=2t,2DF=AE-,(A(2)•••DF//AB,DF=AE,$CDEAEFD7FGCDEr=sCDE7Eᓽ60-4t=2t,(At=10,ᓽrt=10sQAEFD7EA(3)r1=sZiDEF7xyzyE(NECF=90஺)ᡈrt=12sACEF7xyzyE(4EF=90°).ᳮᵫ᝞£ArNEDF=90°sOE//BC.:.Z.ADE-C—30°,•AD=2AE,••CD=43•DF=2t=AE,•AD=43•4t+4£=60,t=¤s/.EDF=90".2rNDEF=90°sDE1EF,•••CDEAEFD7FGCDE•AD//EF,•DELADf••.wADE7xyzyE^ADE=90°,vAA=60°,•Z.DEA=30°,•AD=-AE,2AD=AC-CD=60-43AE=DF=-CD=232:.60—4t=t,(£=12.aᡠr¦=£s4஺9g7xyzyE(ᓃᱏ஺?=90஺)ᡈrC=12swDEF7xyzyE(4DEF=90°).K14⚓ᐳ15⚓

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