1
2017
涓夎鍑芥暟澶ч缁煎悎璁粌
涓�锛庤В绛旈锛堝叡
30
灏忛锛?/p>
1
锛?/p>
锛?/p>
2016
鈥?/p>
鐧藉北涓�妯★級
鍦?/p>
鈻?/p>
ABC
涓紝
瑙?/p>
A
锛?/p>
B
锛?/p>
C
鎵�瀵圭殑杈瑰垎鍒负
a
锛?/p>
b
锛?/p>
c
锛?/p>
宸茬煡
=
锛?/p>
1
锛夋眰瑙?/p>
C
鐨勫ぇ灏忥紝
锛?/p>
2
锛夎嫢
c=2
锛屾眰浣?/p>
鈻?/p>
ABC
闈㈢Н鏈�澶ф椂
a
锛?/p>
b
鐨勫�硷紟
2
锛?/p>
锛?/p>
2016
鈥?/p>
骞垮窞妯℃嫙锛夊湪
鈻?/p>
ABC
涓紝瑙?/p>
A
銆?/p>
B
銆?/p>
C
瀵瑰簲鐨勮竟鍒嗗埆鏄?/p>
a
銆?/p>
b
銆?/p>
c
锛屽凡鐭?/p>
3cosBcosC+2=3sinBsinC+2cos
2
A
锛?/p>
锛?/p>
I
锛夋眰瑙?/p>
A
鐨勫ぇ灏忥紱
锛?/p>
鈪?/p>
锛夎嫢
鈻?/p>
ABC
鐨勯潰绉?/p>
S=5
锛?/p>
b=5
锛屾眰
sinBsinC
鐨勫�硷紟
3
锛?/p>
锛?/p>
2016
鈥?/p>
鎴愰兘妯℃嫙锛夊凡鐭ュ嚱鏁?/p>
f
锛?/p>
x
锛?/p>
=
cos
2
x
锕?/p>
sinxcosx
锕?/p>
sin
2
x
锛?/p>
锛?/p>
鈪?/p>
锛夋眰鍑芥暟
f
锛?/p>
x
锛夊彇寰楁渶澶у�兼椂
x
鐨勯泦鍚堬紱
锛?/p>
鈪?/p>
锛夎
A
銆?/p>
B
銆?/p>
C
涓洪攼瑙掍笁瑙掑舰
ABC
鐨勪笁涓唴瑙掞紝鑻?/p>
cosB=
锛?/p>
f
锛?/p>
C
锛?/p>
=
锕?/p>
锛屾眰
sinA
鐨?/p>
鍊硷紟
4
锛?/p>
锛?/p>
2016
鈥?/p>
鍙板窞妯℃嫙锛?/p>
宸茬煡
a
锛?/p>
b
锛?/p>
c
鍒嗗埆鏄?/p>
鈻?/p>
ABC
鐨勪笁涓唴瑙?/p>
A
锛?/p>
B
锛?/p>
C
鎵�瀵圭殑杈癸紝
涓?/p>
c
2
=a
2
+b
2
锕?/p>
ab
锛?/p>
锛?/p>
1
锛夋眰瑙?/p>
C
鐨勫�硷紱
锛?/p>
2
锛夎嫢
b=2
锛?/p>
鈻?/p>
ABC
鐨勯潰绉?/p>
锛屾眰
a
鐨勫�硷紟
5
锛?/p>
锛?/p>
2016
鈥?/p>
鎯犲窞妯℃嫙锛?/p>
濡傚浘鎵�绀猴紝
鍦ㄥ洓杈瑰舰
ABCD
涓紝
鈭?/p>
D=2
鈭?/p>
B
锛?/p>
涓?/p>
AD=1
锛?/p>
CD=3
锛?/p>
cosB=
锛?/p>
锛?/p>
鈪?/p>
锛夋眰
鈻?/p>
ACD
鐨勯潰绉紱
锛?/p>
鈪?/p>
锛夎嫢
BC=2
锛屾眰
AB
鐨勯暱锛?/p>
6
锛?/p>
锛?/p>
2015
鈥?/p>
灞变笢锛?/p>
鈻?/p>
ABC
涓紝
瑙?/p>
A
锛?/p>
B
锛?/p>
C
鎵�瀵圭殑杈瑰垎鍒负
a
锛?/p>
b
锛?/p>
c
锛?/p>
宸茬煡
cosB=
锛?/p>
sin
锛?/p>
A+B
锛?
=
锛?/p>
ac=2
锛屾眰
sinA
鍜?/p>
c
鐨勫�硷紟