309
鏁欒偛缃?/p>
www.309edu.com
309
鏁欒偛璧勬簮搴?/p>
www.309edu.com
15.2.
銆婄嚎娈电殑鍨傜洿骞冲垎绾裤�?/p>
鎻愰珮缁冧範
涓�銆侀�夋嫨棰?/p>
1
锛庡鍥撅細
Rt
鈻?/p>
ABC
涓紝鈭?/p>
C=90掳
锛?/p>
DE
鏄?/p>
AB
鐨勫瀭鐩村钩鍒嗙嚎锛屸垹
CAD
锛氣垹
DAB=2
锛?/p>
1
锛屽垯鈭?/p>
B
鐨?/p>
搴︽暟涓猴紙
锛?/p>
A
锛?/p>
20掳
B
锛?/p>
22.5掳
C
锛?/p>
25掳
D
锛?/p>
30掳
2
锛庡鍥撅紝鍦ㄢ柍
ABC
涓紝鍒嗗埆浠ョ偣
A
锛?/p>
B
涓哄渾蹇冿紝澶т簬
AB
闀夸负鍗婂緞鐢诲姬锛屼袱寮у垎鍒氦浜庣偣
D
锛?/p>
E
锛屽垯鐩寸嚎
DE
鏄紙
锛?/p>
A
锛庘垹
A
鐨勫钩鍒嗙嚎
B
锛?/p>
AC
杈圭殑涓嚎
C
锛?/p>
BC
杈圭殑楂樼嚎
D
锛?/p>
AB
杈圭殑鍨傜洿骞冲垎绾?/p>
3
锛庡鍥撅紝鈻?/p>
ABC
涓紝
DE
鏄?/p>
AC
鐨勫瀭鐩村钩鍒嗙嚎锛屸柍
ABD
鐨勫懆闀夸负
13
锛屸柍
ABC
鐨勫懆闀夸负
19
锛屽垯
AE
鐨勯暱涓猴紙
锛?/p>
A
锛?/p>
3
B
锛?/p>
6
C
锛?/p>
2
D
锛?/p>
1.5
4
锛?/p>
濡傚浘锛?/p>
鍦ㄢ柍
ABC
涓紝
鈭?/p>
B=30掳
锛?/p>
BC
鐨勫瀭鐩村钩鍒嗙嚎浜?/p>
AB
浜庣偣
E
锛?/p>
鍨傝冻涓?/p>
D
锛?/p>
CE
骞冲垎鈭?/p>
ACB
锛?/p>
鑻?/p>
BE=4
锛屽垯
AE
鐨勯暱涓猴紙
锛?/p>
