绗?/p>
1
椤?/p>
鍏?/p>
26
椤?/p>
2020
骞村叓骞寸骇鏁板涓嬪唽
鍥涜竟褰㈢患鍚堥
閲嶉毦鐐瑰煿浼樼粌涔?/p>
1.
濡傚浘锛屽湪鐭╁舰
ABCD
涓紝
AB=4cm
锛?/p>
BC=8cm
锛岀偣
P
浠庣偣
D
鍑哄彂鍚戠偣
A
杩愬姩锛岃繍鍔ㄥ埌鐐?/p>
A
鍗冲仠姝紱
鍚屾椂鐐?/p>
Q
浠庣偣
B
鍑哄彂鍚戠偣
C
杩愬姩锛岃繍鍔ㄥ埌鐐?/p>
C
鍗冲仠姝紟鐐?/p>
P
銆?/p>
Q
鐨勯�熷害鐨勯�熷害閮芥槸
1cm/s
锛岃繛缁?/p>
PQ
锛?/p>
AQ
锛?/p>
CP
锛岃鐐?/p>
P
銆?/p>
Q
杩愬姩鐨勬椂闂翠负
t
锛?/p>
s
锛夛紟
锛?/p>
1
锛夊綋
t
涓轰綍鍊兼椂锛屽洓杈瑰舰
ABQP
鏄煩褰紵
锛?/p>
2
锛夊綋
t
涓轰綍鍊兼椂锛屽洓杈瑰舰
AQCP
鏄彵褰紵
锛?/p>
3
锛夊垎鍒眰鍑猴紙
2
锛変腑鑿卞舰
AQCP
鐨勫懆闀垮拰闈㈢Н锛?/p>
2.
濡傚浘锛屽湪
Rt
鈻?/p>
ABC
涓紝鈭?/p>
ACB=90
掳锛岃繃鐐?/p>
C
鐨勭洿绾?/p>
m
鈭?/p>
AB
锛?/p>
D
涓?/p>
AB
杈逛笂涓�鐐癸紝杩囩偣
D
浣?/p>
DE
鈯?/p>
BC
锛屼氦鐩寸嚎
m
浜庣偣
E
锛屽瀭瓒充负鐐?/p>
F
锛岃繛鎺?/p>
CD
锛?/p>
BE
锛?/p>
锛?/p>
1
锛夋眰璇侊細
CE=AD
锛?/p>
锛?/p>
2
锛夊綋鐐?/p>
D
鏄?/p>
AB
涓偣鏃讹紝鍥涜竟褰?/p>
BECD
鏄粈涔堢壒娈婂洓杈瑰舰锛熻鏄庝綘鐨勭悊鐢憋紱
锛?/p>
3
锛夊綋鈭?/p>
A
鐨勫ぇ灏忔弧瓒充粈涔堟潯浠舵椂锛屽洓杈瑰舰
BECD
鏄鏂瑰舰锛燂紙涓嶉渶瑕佽瘉鏄庯級