中考备考资料-数学专题讲义汇编953P.pdf

鍒濅腑鍑犱綍缁忓吀棰

涓€銆佽В绛旈锛堝叡20 灏忛锛屾弧鍒? 鍒嗭級

1锛庡凡鐭ワ細濡傚浘锛孫 鏄崐鍦嗙殑鍦嗗績锛孋銆丒 鏄渾涓婄殑涓ょ偣锛孋D 鈯B 锛孍F 鈯B 锛孍G 鈯O 锛

姹傝瘉锛欳D=GF锛庯紙鍒濅簩锛

2 锛庡凡鐭ワ細濡傚浘锛孭 鏄鏂瑰舰ABCD 鍐呯偣锛屸垹 PAD=鈭 PDA=15掳锛庢眰璇侊細鈻砅BC 鏄涓夎褰紟锛堝垵浜岋級

3 锛庡鍥撅紝宸茬煡鍥涜竟褰BCD 銆丄 B C D 閮芥槸姝ｆ柟褰紝A 銆丅 銆丆 銆丏 鍒嗗埆鏄疉A 銆丅B 銆丆C 銆丏D 鐨勪腑鐐癸紟 1 1 1 1 2 2 2 2 1 1 1 1

姹傝瘉锛氬洓杈瑰舰A B C D 鏄鏂瑰舰锛庯紙鍒濅簩锛 2 2 2 2

4 锛庡凡鐭ワ細濡傚浘锛屽湪鍥涜竟褰BCD 涓紝AD=BC 锛孧 銆丯 鍒嗗埆鏄疉B 銆丆D 鐨勪腑鐐癸紝AD 銆丅C 鐨勫欢闀跨嚎浜N 浜嶦銆丗 锛

姹傝瘉锛氣垹 DEN=鈭 F 锛

5 锛庡凡鐭ワ細鈻矨BC 涓紝H 涓哄瀭蹇冿紙鍚勮竟楂樼嚎鐨勪氦鐐癸級锛孫 涓哄蹇冿紝涓擮M 鈯C 浜嶮 锛 锛?锛夋眰璇侊細AH=2OM 锛 锛? 锛夎嫢鈭 BAC=60掳锛屾眰璇侊細AH=AO 锛庯紙鍒濅簩锛

6 锛庤MN 鏄渾O 澶栦竴鐩寸嚎锛岃繃O 浣淥A 鈯N 浜嶢 锛岃嚜A 寮曞渾鐨勪袱鏉＄洿绾匡紝浜ゅ渾浜嶣 銆丆 鍙奃 銆丒 锛岀洿绾縀B 鍙

CD 鍒嗗埆浜N 浜嶱 銆丵 锛

姹傝瘉锛欰P=AQ 锛庯紙鍒濅簩锛

7 锛庡鏋滀笂棰樻妸鐩寸嚎MN 鐢卞渾澶栧钩绉昏嚦鍦嗗唴锛屽垯鐢辨鍙緱浠ヤ笅鍛介锛氳MN 鏄渾O 鐨勫鸡锛岃繃MN 鐨勪腑鐐笰 浠讳綔涓ゅ鸡

BC 銆丏E 锛岃CD銆丒B 鍒嗗埆浜N 浜嶱 銆丵 锛

姹傝瘉锛欰P=AQ 锛庯紙鍒濅簩锛