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
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ͼͼΣÿӦڵֱ߶ͬһ㣬ôͼλͼΣ λͼλĵľ֮ȵλƱȣ ȷǣ
٢ ۢ ڢۢ A B C D
⣨4С⣩
212014?ݣͼƽBCֱDEѡABCֳɵȣ
= _________
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3Dab߶ABϣֱд2ı仯DĶӦD2꣮
262014?ͨͼEABCDԽCAӳһ㣬߶AEΪһAEFGAEFGABCDEBGD 1֤EB=GD
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2ıAEFDΪʱxֵ 3DEFֱʱxֵ
282014?УȱABCı߳Ϊ6ACBCϸȡһEFAFBEཻڵP 1AE=CF
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2жϡMFNBDC֮Ĺϵ˵ɣ
302014?̩ͼıABCDУAB=ADACBDڵEADB=ACB 1֤
=
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һѡ⣨20С⣩ 12014?ɽƶε֮Ϊ14ǵ֮ܳΪ A 1 4 B 12 C 21 D 41
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ѡB
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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=6õPP3
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