绗?/p>
1
椤碉紙鍏?/p>
6
椤碉級
瑙ｇ洿瑙掍笁瑙掑舰
鍙傝�冪瓟妗堜笌璇曢瑙ｆ瀽
涓�锛庨�夋嫨棰橈紙鍏?/p>
9
灏忛锛?/p>
1
锛?/p>
锛?/p>
2018鈥?/p>
瀛濇劅锛夊鍥撅紝鍦?/p>
Rt
鈻?/p>
ABC
涓紝鈭?/p>
C=90掳
锛?/p>
AB=10
锛?/p>
AC=8
锛屽垯
sinA
绛変簬锛?/p>
锛?/p>
A
锛?/p>
B
锛?/p>
C
锛?/p>
D
锛?/p>
銆愬垎鏋愩�?/p>
鍏堟牴鎹嬀鑲″畾鐞嗘眰寰?/p>
BC=6
锛屽啀鐢辨寮﹀嚱鏁扮殑瀹氫箟姹傝В鍙緱锛?/p>
銆愯В绛斻�?/p>
瑙ｏ細鍦?/p>
Rt
鈻?/p>
ABC
涓紝鈭?/p>
AB=10
銆?/p>
AC=8
锛?/p>
鈭?/p>
BC=
=
=6
锛?/p>
鈭?/p>
sinA=
=
=
锛?/p>
鏁呴�夛細
A
锛?/p>
2
锛?/p>
锛?/p>
2018鈥?/p>
缁甸槼锛変竴鑹樺湪鍗楀寳鑸嚎涓婄殑娴嬮噺鑸癸紝浜?/p>
A
鐐瑰娴嬪緱娴峰矝
B
鍦ㄧ偣
A
鐨勫崡鍋忎笢
30掳
鏂瑰悜锛?/p>
缁х画鍚戝崡鑸
30
娴烽噷鍒拌揪
C
鐐规椂锛屾祴寰楁捣宀?/p>
B
鍦?/p>
C
鐐圭殑鍖楀亸涓?/p>
15掳
鏂瑰悜锛岄偅涔堟捣宀?/p>
B
绂绘鑸?/p>
绾跨殑鏈�杩戣窛绂绘槸锛?/p>
锛?/p>
锛堢粨鏋滀繚鐣欏皬鏁扮偣鍚庝袱浣嶏級
锛堝弬鑰冩暟鎹細
鈮?/p>
1.732
锛?/p>
鈮?/p>
1.414
锛?/p>
A
锛?/p>
4.64
娴烽噷
B
锛?/p>
5.49
娴烽噷
C
锛?/p>
6.12
娴烽噷
D
锛?/p>
6.21
娴烽噷
銆愬垎鏋愩�?/p>
鏍规嵁棰樻剰鐢诲嚭鍥惧舰锛岀粨鍚堝浘褰㈢煡鈭?/p>
BAC=30掳
銆佲垹
ACB=15掳
锛屼綔
BD
鈯?/p>
AC
浜庣偣
D
锛屼互鐐?/p>
B
涓洪《鐐广�?/p>
BC
涓鸿竟锛?/p>
鍦ㄢ柍
ABC
鍐呴儴浣溾垹
CBE=
鈭?/p>
ACB=15掳
锛?/p>
璁?/p>
BD=x
锛?/p>
鍒?/p>
AB=BE=CE=2x
銆?/p>
AD=DE=
x
锛?/p>
鎹寰楀嚭
AC=2
x
+
2x
锛屾牴鎹鎰忓垪鍑烘柟绋嬶紝姹傝В鍙緱锛?/p>
銆愯В绛斻�?/p>
瑙ｏ細濡傚浘鎵�绀猴紝
鐢遍鎰忕煡锛屸垹
BAC=30掳
銆佲垹
ACB=15掳
锛?/p>
浣?/p>
BD
鈯?/p>
AC
浜庣偣
D
锛屼互鐐?/p>
B
涓洪《鐐广�?/p>
BC
涓鸿竟锛屽湪鈻?/p>
ABC
鍐呴儴浣溾垹
CBE=
鈭?/p>
ACB=15掳
锛?/p>
鍒欌垹
BED=30掳
锛?/p>
BE=CE
锛?/p>
璁?/p>
BD=x
锛?/p>
鍒?/p>
AB=BE=CE=2x
锛?/p>
AD=DE=
x
锛?/p>