涓冨勾绾у煿浼橀
1
銆?/p>
濡傚浘锛?/p>
鍦ㄤ竴涓鏂逛綋鐨勪袱涓潰涓婄敾浜嗕袱鏉″瑙掔嚎
AB
锛?/p>
AC
锛?/p>
閭ｄ箞杩欎袱鏉″瑙掔嚎鐨勫す瑙掔瓑浜?/p>
搴︺�?/p>
2.
銆?/p>
.
2
2
1
x
x
x
飥?/p>
飥?/p>
飥?/p>
飥?/p>
飥?/p>
鐨勬渶灏忓�兼槸
_______
3
銆?/p>
宸茬煡
0
1
3
2
飥?/p>
飥?/p>
飥?/p>
x
x
,
鍒?/p>
飥?/p>
飥?/p>
飥?/p>
1
3
2
4
2
x
x
x
銆?/p>
4,
涓�涓暱鏂逛綋鐨勯暱銆佸銆侀珮鍒嗗埆涓?/p>
9cm, 6cm, 5cm
锛屽厛浠庤繖涓暱鏂逛綋涓婂敖鍙兘澶х殑鍒囦笅涓�涓鏂逛綋锛屽啀浠庡墿
浣欓儴鍒嗕笂鍙堝敖鍙兘澶х殑鍒囦笅涓�涓鏂逛綋锛屾渶鍚庡啀浠庣浜屾鍓╀綑閮ㄥ垎涓婂張灏藉彲鑳藉ぇ鐨勫垏涓嬩竴涓鏂逛綋锛岄偅涔?/p>
缁忚繃涓夋鍒囧壊鍚庡墿浣欓儴鍒嗙殑浣撶Н涓?/p>
cm
3
.
5
銆?/p>
濡傚浘锛屼笁瑙掑舰
ABC
鐨勯潰绉负
1
锛?/p>
BD
鈭?/p>
DC=2
鈭?/p>
1
锛?/p>
E
涓?/p>
AC
鐨勪腑鐐癸紝
AD
涓?/p>
BE
鐩镐氦浜?/p>
P
锛岄偅鍥涜竟褰?/p>
PDCE
鐨勯潰
绉负
銆?/p>
6
銆?/p>
濡傚浘锛屽凡鐭ユ褰?/p>
ABCD
锛?/p>
AD
鈭?/p>
BC
锛屸垹
B+
鈭?/p>
C=90
掳锛?/p>
EF=10
锛?/p>
E
锛?/p>
F
鍒嗗埆鏄?/p>
AD
锛?/p>
BC
鐨勪腑鐐癸紝鍒?/p>
BC
锛?/p>
AD
锛?/p>
________
7
銆?/p>
濡傚浘锛屾鏂瑰舰
ABCD
鐨勮竟闀夸负
1
锛?/p>
P
涓?/p>
AB
涓婄殑鐐癸紝
Q
涓?/p>
AD
涓婄殑鐐癸紝涓斺柍
APQ
鐨勫懆闀夸负
2
锛?/p>
鍒欌垹
PCQ=_______
8
銆?/p>
鍦ㄩ暱鏂瑰舰鍐呯敾涓�浜涚洿绾匡紝宸茬煡杈逛笂鏈変笁鍧楅潰绉垎鍒负
13
锛?/p>
35
锛?/p>
49
锛屽浘涓殑鏁版嵁琛ㄧず鎵�鍦ㄧ殑灏忓潡闈㈢Н锛?/p>
鍒欏浘涓殑闃村奖閮ㄥ垎鐨勯潰绉负
銆?/p>
9
銆?/p>
濡傚浘锛岃
O
鏄瓑杈逛笁瑙掑舰
ABC
鍐呬竴鐐癸紝
宸茬煡鈭?/p>
AOB=115
掳锛屸垹
BOC=125
掳锛屽垯浠?/p>
OA
锛?/p>
OB
锛?/p>
OC
涓鸿竟鎵�鏋勬垚鐨勪笁瑙掑舰鐨勫悇鍐?/p>
瑙掔殑搴︽暟鍒嗗埆涓?/p>
銆?/p>
10
銆?/p>
宸茬煡
a
銆?/p>
b
銆?/p>
c
閮戒笉绛変簬闆讹紝涓?/p>
c
c
b
b
a
a
m
|
|
|
|
|
|
飥?/p>
飥?/p>
飥?
锛?/p>
|
|
abc
abc
n
飥?/p>
锛岄偅涔?/p>
n
m
飥?/p>
=_______
11
濡傛灉
a
銆?/p>
b
銆?/p>
c
婊¤冻
a
+2
b
+3
c
=12
锛屼笖
a
2
+
b
2
+
c
2
=
ab
+
ac
+
bc
锛屽垯浠ｆ暟寮?/p>
a
+
b
2
+
c
3
=_______
12
.
濡傚浘锛屽湪闀挎柟褰?/p>
ABCD
涓紝宸茬煡
AD=12
銆?/p>
AB=5
銆?/p>
BD=AC=13
锛?/p>
P
鏄?/p>
AD
涓婁换鎰忎竴鐐癸紝
PE
鈯?/p>
BD
銆?/p>
PF
鈯?/p>
AC
锛岄偅涔?/p>
PE+PF=
_______
銆愭彁绀?/p>
闀挎柟褰㈢殑瀵硅绾跨浉绛変笖浜掔浉骞冲垎銆?/p>
13.
鍦ㄢ娍
ABC
涓紝
AD
鈯?/p>
BC
锛屽瀭瓒充负
D
锛?/p>
AB+BD=DC
锛屾眰璇?/p>
鈭?/p>
B=2
鈭?/p>
C