青岛版九年级数学上册?章图形的相似中考原题训?附答? - 百度文库

ʱ : һ 青岛版九年级数学上册?章图形的相似中考原题训?附答? - 百度文库ϿʼĶ

ͼһλͼΣλͼһͼΣ λͼһλģ

ͼͼΣÿӦڵֱ߶ͬһ㣬ôͼλͼΣ λͼλĵľ֮ȵλƱȣ ȷǣ

٢ ۢ ڢۢ A B C D

⣨4С⣩

212014?ݣͼƽBCֱDEѡABCֳɵȣ

= _________

222014?£֪ABCDEFAB=5BC=6CA=9DE=3ôDEFܳ _________ 232014?ΫͼijˮƽϽĸ߶ΪABڵD͵Fֱ2׵ıCDEF52ףҽABCDEFͬһֱƽڣӱCD2׵GGýﶥAͱ˶CͬһֱϣӱFE4׵HHýﶥAͱ˶Eͬһֱϣĸ _________ ף

242013?ׯ֪ABCDУAB=1BCȡһEABEAE۵ʹBADϵF㣮ıEFDCABCDƣAD= _________

⣨6С⣩ 252014?ӪڣͼƽֱϵУABCֱΪA21B14C32 1ABCyԳƵͼΡA1B1C1ֱдC1ꣻ

2ԭOΪλģλƱΪ12y࣬ABCŴͼΡA2B2C2ֱдC2ꣻ

3Dab߶ABϣֱд2ı仯DĶӦD2꣮

262014?ͨͼEABCDԽCAӳһ㣬߶AEΪһAEFGAEFGABCDEBGD 1֤EB=GD

2DAB=60㣬AB=2AG=

GDij

272014?÷ݣͼRtABCУB=90㣬AC=60AB=30DACϵĶ㣬DDFBCFFFEACABECD=xDF=y 1yxĺϵʽ

2ıAEFDΪʱxֵ 3DEFֱʱxֵ

282014?УȱABCı߳Ϊ6ACBCϸȡһEFAFBEཻڵP 1AE=CF

֤AF=BEAPBĶ AE=2AP?AFֵ

2AF=BEEӵA˶CʱP·

292014?ͲͼıABCDУACBDBDڵEFMֱABBCе㣬BNƽ֡ABEAMڵNAB=AC=BDMFNF 1жϡBMN״֤Ľۣ

2жϡMFNBDC֮Ĺϵ˵ɣ

302014?̩ͼıABCDУAB=ADACBDڵEADB=ACB 1֤

=

2ABACAEEC=12FBCе㣬֤ıABFDΣ

ൺ꼶ѧϲ1ͼεпԭ

ѵ

ο

һѡ⣨20С⣩ 12014?ɽƶε֮Ϊ14ǵ֮ܳΪ A 1 4 B 12 C 21 D 41

㣺 ƶεʣ

ƶε֮ȵƱȵƽ֮ܳȵƱȣͿ⣮ ⣺ƶΪ14

֮ܳΪ=12

ѡB

⿼ƶεʣƶζӦ֮ȡ֮ܳȵƱȣ֮ȵƱȵƽ

22014?ϾABCABC䣬ƱΪ12ABCABCıΪ A 1 2 B 21 C 14 D 41

㣺 εʣ

ıȵƱȵƽ㼴ɵý⣮ ⣺ABCABC䣬ƱΪ12

ABCABCıΪ14 ѡC

⿼εʣıȵƱȵƽǽĹؼ 32014?ͼڷֽУABC͡EPDĶڸϣҪʹABCEPDPڵĸΪ

A P 1 B P2

㣺 εж ר⣺ ͣ

ڡBAC=PED=90㣬=

C P3 D P4

=ʱɸӦߵıҼнǶӦȵ

жϡABCEPDȻDE=4EP=6׵õPP3

⣺BAC=PED

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