濡傚浘,涓€鍧楁?褰㈢幓鐠冪殑涓嬪簳鍙婁袱鑵扮殑涓€閮ㄥ垎琚?憯纰?閲忓緱鈭燗=120掳,鈭燚=105掳,浣犺兘鍚︽

濡傚浘,鐢?8涓?竟闀跨浉绛夌殑姝ｆ柟褰㈢粍鎴愮殑闀挎柟褰?BCD涓?鍖呭惈鏈夆€?鈥濆湪鍐呯殑闀挎柟褰㈠強姝ｆ柟褰? 28.濡傚浘,宸茬煡鐐笲銆丆銆丏鍦ㄥ悓涓€鏉＄洿绾夸笂,鈻矨BC鍜屸柍CDE閮芥槸绛夎竟涓夎?褰?BE浜?C浜嶧,AD 宸茬煡,濡傚浘鎵€绀?鎶樺彔闀挎柟褰㈢殑涓€杈笰D,浣跨偣D钀藉湪BC杈圭殑鐐笷澶?濡傛灉AB=6cm,AD=10c 濡傚浘鎵€绀?鐩寸嚎L1鈭?2,L3鈯?4,鏈変笁涓?懡棰橈細鈶犫垹1+鈭?=90掳,鈶♀垹2+鈭?=90掳,鈶⑩垹2 濡傚浘鎵€绀?鍦ㄦ?褰?BCD涓?AD鈥朆C,AE鈯?C浜嶦,鑻?E=12,BD=15,AC=20, 姹傛?褰?BCD 鏈変竴鎵瑰舰鐘跺ぇ灏忕浉鍚岀殑涓嶉攬閽㈢墖鏄?洿瑙掍笁瑙掑舰,宸茬煡鈭燙=90掳,AB=5cm,BC=3cm 濡傚浘,涓€浜烘嬁鐫€涓€鏀?埢鏈夊帢绫冲垎搴︾殑灏忓昂,绔欏湪璺濈數绾挎潌绾︽湁20m鐨 B澶?鎶婃墜鑷傚悜鍓嶄几鐩? 濡傚浘,P涓烘?鏂瑰舰ABCD鍐呬竴鐐?灏嗏柍APB缁曠偣B鎸夐€嗘椂閽堟柟鍚戞棆杞?0掳寰楀埌鈻矪P鈥睲,鍏朵腑P涓 涓€涓?嚑浣曚綋鏄?粠楂樹负4m,搴曢潰鍗婂緞涓?cm鐨勫渾鏌变腑鎸栨帀涓€涓?渾閿ュ悗寰楀埌鐨?鍦嗛敟鐨勫簳闈㈠氨鏄 濡傚浘,鐜嬪崕鏅氫笂鐢辫矾鐏疉涓嬬殑B澶勮蛋鍒癈澶勬椂,娴嬪緱褰卞瓙CD鐨勯暱涓?绫?缁х画寰€鍓嶈蛋3绫冲埌杈綞澶勬 濡傚浘鎵€绀?鏈変袱涓?ソ鏈嬪弸鍒嗗埆灞呬綇鍦ˋ鍜孊涓や釜灏忛晣,杩欎袱涓?皬闀囪?涓€鏉℃渤闅斿紑浜?鐜板噯澶囧湪娌 5.濡傚浘鎵€绀?宸茬煡鐩寸嚎y1=x+m涓巟杞淬€亂杞村垎鍒?氦浜庣偣A銆丅,涓庡弻鏇茬嚎y2= 锛坘2锛夋眰鍑虹偣