鍔ㄦ�侀棶棰?/p>
涓�銆侀�夋嫨棰?/p>
1.
锛?/p>
2016
路婀栧寳閯傚窞锛?/p>
濡傚浘锛?/p>
O
鏄竟闀夸负
4cm
鐨勬鏂瑰舰
ABCD
鐨勪腑蹇冿紝
M
鏄?/p>
BC
鐨勪腑鐐癸紝鍔?/p>
鐐?/p>
P
鐢?/p>
A
寮�濮嬫部鎶樼嚎
A
鈥?/p>
B
鈥?/p>
M
鏂瑰悜鍖�閫熻繍鍔紝鍒?/p>
M
鏃跺仠姝㈣繍鍔紝閫熷害涓?/p>
1cm/s.
璁?/p>
P
鐐圭殑杩?/p>
鍔ㄦ椂闂翠负
t(s)
锛岀偣
P
鐨勮繍鍔ㄨ矾寰勪笌
OA
銆?/p>
OP
鎵�鍥存垚鐨勫浘褰㈤潰绉负
S(cm
2
)
锛屽垯鎻忚堪闈㈢Н
S(cm
2
)
涓庢椂闂?/p>
t(s)
鐨勫叧绯荤殑鍥惧儚鍙互鏄紙
A
锛?/p>
2.
濡傚浘锛屽湪
鈻?/p>
ABC
涓紝
AB=10
锛?/p>
AC=8
锛?/p>
BC=6
锛屼互杈?/p>
AB
鐨勪腑鐐?/p>
O
涓哄渾蹇冿紝浣滃崐鍦嗕笌
AC
鐩稿垏锛岀偣
P
锛?/p>
Q
鍒嗗埆鏄竟
BC
鍜屽崐鍦嗕笂鐨勫姩鐐癸紝杩炴帴
PQ
锛屽垯
PQ
闀跨殑鏈�澶у�间笌鏈�灏忓�肩殑鍜屾槸
锛?/p>
C
锛?/p>
A
锛?/p>
6
B
锛?/p>
2
+1
C
锛?/p>
9
D
锛?/p>
3.
濡傚浘锛屽湪
鈻?/p>
ABC
涓紝鈭?/p>
ACB=90
掳
锛?/p>
AC=4
锛?/p>
BC=2
锛?/p>
P
鏄?/p>
AB
杈逛笂涓�鍔ㄧ偣锛?/p>
PD
鈯?/p>
AC
浜庣偣
D
锛?/p>
鐐?/p>
E
鍦?/p>
P
鐨勫彸渚э紝涓?/p>
PE=1
锛岃繛缁?/p>
CE
锛?/p>
P
浠庣偣
A
鍑哄彂锛屾部
AB
鏂瑰悜杩愬姩锛屽綋
E
鍒拌揪鐐?/p>
B
鏃讹紝
P
鍋滄杩愬姩锛庡湪鏁翠釜杩愬姩杩囩▼涓紝鍥句腑闃村奖閮ㄥ垎闈㈢Н
S
1
+S
2
鐨勫ぇ灏忓彉鍖栨儏鍐垫槸锛?/p>
C
锛?/p>
A
锛庝竴鐩村噺灏?/p>
B
锛庝竴鐩翠笉鍙?/p>
C
锛庡厛鍑忓皬鍚庡澶?/p>
D
锛庡厛澧炲ぇ鍚庡噺灏?/p>
4
锛?/p>
濡傚浘锛?/p>
姝?/p>
鈻?/p>
ABC
鐨勮竟闀夸负
4
锛?/p>
鐐?/p>
P
涓?/p>
BC
杈逛笂鐨勪换鎰忎竴鐐?/p>
锛堜笉涓庣偣
B
銆?/p>
C
閲嶅悎锛?/p>
锛?/p>
涓斺垹
APD=60
掳
锛?/p>
PD
浜?/p>
AB
浜庣偣
D
锛庤
BP=x
锛?/p>
BD=y
锛屽垯
y
鍏充簬
x
鐨勫嚱鏁板浘璞″ぇ鑷存槸锛?/p>
C
锛?/p>