2018-
2019
瀛﹀勾鍒濅腑鏁板鍖楀笀澶х増涔濆勾绾т笅鍐岀涓�
绔犮�婄洿瑙掍笁瑙掑舰鐨勮竟瑙掑叧绯汇�嬫娴嬮
B
涓�銆侀�夋嫨棰?/p>
1.
鍦?/p>
Rt
鈻?/p>
ABC
涓紝
鈭?/p>
C=90掳
锛?/p>
AC=1
锛?/p>
BC=3
锛屽垯
鈭?/p>
A
鐨勬鍒囧�间负锛堬級
A
銆?/p>
3
B
銆?/p>
C
銆?/p>
D
銆?/p>
+
2.
鈻?/p>
ABC
鍦ㄧ綉鏍间腑鐨勪綅缃鍥炬墍绀猴紙姣忎釜灏忔鏂瑰舰杈归暱涓?/p>
1
锛?/p>
锛?/p>
AD
鈯?/p>
BC
浜?/p>
D
锛屼笅鍒?/p>
鍥涗釜閫夐」涓紝閿欒
鐨勬槸锛堬級
A
銆?/p>
sin伪=cos伪
B
銆?/p>
tanC=2 C
銆?/p>
sin尾=cos尾
D
銆?/p>
tan伪=1
+
3.
濡傚浘锛屽湪
鈻?/p>
ABC
涓紝
AC
鈯?/p>
BC
锛?/p>
鈭?/p>
ABC=30掳
锛岀偣
D
鏄?/p>
CB
寤堕暱绾夸笂鐨勪竴鐐癸紝涓?/p>
BD=B
A
锛屽垯
tan
鈭?/p>
DAC
鐨勫�间负锛堬級