.
.
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涓�銆佸～绌洪锛氾紙
30
鍒嗭級
1
锛庡湪
Rt
鈻?/p>
ABC
涓紝鈭?/p>
C=90
掳锛?/p>
2a=b
锛屽垯
tanA=______
锛?/p>
sinA=_______
銆?/p>
2
锛?/p>
sin55
掳銆?/p>
cos36
掳銆?/p>
sin56
掳鐨勫ぇ灏忓叧绯绘槸
____<____<____
銆?/p>
3
锛庡湪鈻?/p>
ABC
涓紝鈭?/p>
C=90
掳锛屽鏋?/p>
3
1
tan
飥?/p>
A
锛屽垯
cosB=_______
銆傚鏋?/p>
0
3
cos
4
2
飥?/p>
飥?/p>
A
锛屾槸鈭?/p>
A=______
搴︺�?/p>
4
锛庝竴涓洿瑙掍笁瑙掑舰鏈変袱鏉¤竟闀夸负
3
鍜?/p>
4
锛屽垯杈冨皬閿愯鐨勬鍒囧�兼槸
_________
銆?/p>
5
锛庡鍥?/p>
6-29
锛屾煇椋炴満浜庣┖涓?/p>
A
澶勬帰娴嬪緱鍦伴潰鐩爣
C
锛屾鏃堕琛岄珮搴?/p>
AC=hM
锛屼粠椋炴満涓婄湅鍒板湴闈㈡帶鍒剁偣
B
鐨勪刊瑙掍负
伪
锛屽垯椋炴満
A
鍒版帶鍒剁偣
B
鐨勮窛绂绘槸
__________M
銆?/p>
6
銆佸湪
Rt
鈻?/p>
ABC
涓紝鈭?/p>
C
锛?/p>
90
掳锛?/p>
a
锛?/p>
2
锛?/p>
b
锛?/p>
3
锛屽垯
cosA
锛濓紝
sinB
锛濓紝
tanB
锛濄�?/p>
7
銆佺洿瑙掍笁瑙掑舰
ABC
鐨勯潰绉负
24cm
2
锛岀洿瑙掕竟
AB
涓?/p>
6cm
锛屸垹
A
鏄攼瑙掞紝鍒?/p>
sinA
锛濄�?/p>
8
銆佸凡鐭?/p>
tan
飦?/p>
锛?
12
5
锛?/p>
飦?/p>
鏄攼瑙掞紝鍒?/p>
sin
飦?/p>
锛濄�?/p>
9
銆?/p>
cos
2
(50
掳锛?/p>
飦?/p>
)
锛?/p>
cos
2
(40
掳锛?/p>
飦?/p>
)
锛?/p>
tan(30
掳锛?/p>
飦?/p>
)tan(60
掳锛?/p>
飦?/p>
)
锛濓紱
10
銆佸鍥?/p>
1
锛屾満鍣ㄤ汉浠?/p>
A
鐐癸紝娌跨潃瑗垮崡鏂瑰悜锛岃浜嗕釜
4
2
鍗曚綅锛屽埌杈?/p>
B
鐐瑰悗瑙傚療鍒板師鐐?/p>
O
鍦ㄥ畠鐨勫崡鍋忎笢
60
掳鐨勬柟鍚戜笂锛屽垯鍘熸潵
A
鐨勫潗鏍囦负
.
锛堢粨鏋滀繚鐣欐牴鍙凤級锛?/p>
锛?/p>
1
锛?/p>
锛?/p>
2
锛?/p>
锛?/p>
3
锛?/p>
11
銆佺瓑鑵颁笁瑙掑舰搴曡竟闀?/p>
10cm
锛屽懆闀?/p>
涓?/p>
36cm
锛屽垯
涓�
搴?/p>
瑙?/p>
鐨?/p>
姝?
鍒囧�间负
.
12
銆佹煇浜烘部鐫�鍧″害
i=1:
3
鐨勫北鍧?/p>
璧颁簡
50M
锛屽垯
浠?/p>
绂?/p>
鍦?/p>
闈?/p>
M
楂樸�?/p>
13
銆佸鍥?/p>
2
锛屽湪鍧″害涓?/p>
1
锛?/p>
2
鐨勫北鍧′笂绉嶆爲锛岃姹傛牚璺濓紙鐩搁偦涓ゆ爲闂寸殑姘村钩璺濈锛夋槸
6M
锛屾枩鍧′笂鐩搁偦涓ゆ爲
闂寸殑鍧￠潰璺濈鏄?/p>
M
銆?/p>
14
銆佸湪鈻矨BC
涓紝鈭燗CB锛?0掳锛?/p>
cosA=
3
3
锛?/p>
AB
锛?/p>
8cm
锛屽垯鈻矨BC
鐨勯潰绉负
______
銆?/p>
15
銆佸鍥?/p>
3
锛屽湪涓�涓埧闂村唴鏈変竴涓瀛愭枩闈犲湪澧欎笂锛屾瀛愰《绔窛鍦伴潰鐨勫瀭鐩磋窛绂?/p>
MA
涓?/p>
aM
锛屾鏃讹紝姊瓙鐨?/p>
鍊炬枩瑙掍负
75
掳锛屽鏋滄瀛愬簳绔笉鍔紝椤剁闈犲湪瀵归潰澧欎笂
N
锛屾鏃舵瀛愰《绔窛鍦伴潰鐨勫瀭鐩磋窛绂?/p>
NB
涓?/p>
bM
锛屾
瀛愮殑鍊炬枩瑙?/p>
45
掳锛屽垯杩欓棿鎴垮瓙鐨勫
AB
鏄?/p>
_M
銆?/p>
x
O
A
y
B