( )
( )
( )
( )
C
B
A
D
B
C
A
D
C
A
B
绛夎叞涓夎褰?/p>
銆愬涔犵洰鏍囥�?/p>
1
锛庝簡瑙ｇ瓑鑵颁笁瑙掑舰鐨勬蹇碉紝鎺屾彙绛夎叞涓夎褰⑩�滅瓑杈瑰绛夎鈥濈殑鎬ц川锛?/p>
2
锛庤繍鐢ㄧ瓑鑵颁笁瑙掑舰鐨勬蹇靛強鎬ц川瑙ｅ喅鐩稿叧闂锛?/p>
3
锛庡紩瀵煎鐢熷鍥惧舰鐨勮瀵熴�佸彂鐜般�佹縺鍙戝鐢熺殑濂藉蹇冨拰姹傜煡娆诧紟
銆愬涔犻噸鐐广�戠瓑鑵颁笁瑙掑舰鈥滅瓑杈瑰绛夎鈥濈殑鎬ц川鍙婂簲鐢紟
銆愬涔犻毦鐐广�戠瓑鑵颁笁瑙掑舰鈥滅瓑杈瑰绛夎鈥濈殑鎬ц川璇佹槑锛?/p>
銆愬鍓嶅噯澶囥�?/p>
璁ょ湡闃呰璇炬湰
P75---P76
锛屽畬鎴愮粌涔?/p>
1
锛庡涔狅細
锛?/p>
1
锛変笁瑙掑舰鎸夎竟鏉ュ垎绫伙紝鍙垎涓?/p>
涓夎褰㈠拰
涓夎褰?/p>
锛?/p>
锛?/p>
2
锛夋湁涓よ竟鐩哥瓑鐨勪笁瑙掑舰鍙?/p>
锛岀浉绛夌殑涓よ竟鍙?/p>
锛屽彟涓�杈瑰彨
涓よ叞鐨勫す瑙掑彨
锛岃叞鍜屽簳杈圭殑澶硅鍙?/p>
濡傚浘锛屽湪鈻矨BC
涓紝
AB=AC
锛屾爣鍑哄悇閮ㄥ垎鍚嶇О锛?/p>
2.
鎬濊�冿細
绛夎叞涓夎褰㈡槸杞村绉板浘褰㈠悧锛熷鏋滄槸锛?/p>
灏嗙瓑鑵颁笁瑙掑舰瀵规姌锛?/p>
涓や釜搴曡鐨勬暟閲忓叧绯绘槸
锛?/p>
褰掔撼绛夎叞涓夎褰㈡�ц川锛?/p>
鎬ц川
1
绛夎叞涓夎褰㈢殑涓や釜
鐩哥瓑锛堢畝鍐欐垚鈥?/p>
鈥濓級
鏁板绗﹀彿璇█锛氣埖 AB=AC
鈭?/p>
锛堢瓑杈?/p>
瀵圭瓑瑙掞級
璇曚竴璇?/p>
锛岃繍鐢ㄤ笁瑙掑舰鐨勫叏绛夎瘉鏄庝笂杩版�ц川
3
锛庣粌涔狅細
锛?/p>
1
锛夌瓑鑵颁笁瑙掑舰椤惰涓?/p>
30
掳锛岄偅涔堝畠鐨勪竴涓簳瑙掔殑搴︽暟鏄?/p>
锛?/p>
锛?/p>
2
锛夌瓑鑵颁笁瑙掑舰搴曡涓?/p>
30掳锛岄偅涔堝畠鐨勯《瑙掔殑搴︽暟鏄?/p>
锛?/p>
锛?/p>
3
锛夌瓑鑵扮洿瑙掍笁瑙掑舰鐨勪竴涓攼瑙?/p>
鐨勫害鏁版槸
锛?/p>
锛?/p>
4
锛夌瓑鑵颁笁瑙掑舰鐨勪竴涓唴瑙掍负
50掳锛屽垯椤惰鐨勫害鏁版槸
锛?/p>
锛?/p>
5
锛夊鍥撅紝鈻矨BC
涓紝
AB=AC
锛屽瑙掆垹
DAC=64
掳锛屽垯鈭?/p>
B
=_________掳锛?/p>
銆愯鍫傛帰绌躲�?/p>
4
锛庤В涓嬪垪鍚勯
锛?/p>
1
锛夌瓑鑵颁笁瑙掑舰鐨勯《瑙掍负
7
0掳锛屾眰瀹冪殑涓�涓簳瑙掔殑搴︽暟锛?/p>
锛?/p>
2
锛夌瓑鑵颁笁瑙掑舰鏈変竴涓涓?/p>
7
0掳锛屾眰瀹冪殑涓�
涓簳瑙掔殑搴︽暟锛?/p>
5
锛庡鍥撅紝鍦ㄢ柍ABC
涓紝鐐?/p>
D
鍦?/p>
BC
涓婏紝
AB=AD=DC
锛屸垹BAD=26掳锛屾眰鈭燘
鍜屸垹C
鐨勫害鏁帮紟
鏁欏笀浜屾澶囪
澶囪鏁欏笀锛?/p>
A
B
C