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
A
涓�銆侀�夋嫨棰?/p>
1.
濡傚浘锛屽湪
Rt
鈻?/p>
ABC
涓紝
鈭?/p>
C=90掳
锛?/p>
BC=4
锛?/p>
AC=3
锛屽垯
sinB=
锛堬級
A
銆?/p>
B
銆?/p>
C
銆?/p>
D
銆?/p>
+
2.
濡傚浘锛屽凡鐭ワ細
45掳
锛?/p>
鈭?/p>
A
锛?/p>
90掳
锛屽垯涓嬪垪鍚勫紡鎴愮珛鐨勬槸锛堬級
A
銆?/p>
sinA=cosA B
銆?/p>
sinA
锛?/p>
cosA C
銆?/p>
sinA
锛?/p>
tanA D
銆?/p>
sinA
锛?/p>
cosA
+
3.
鍦?/p>
Rt
鈻?/p>
ABC
涓紝
鈭?/p>
C=90掳
锛岃嫢
sinA=
锛屽垯
cosA
鐨勫�间负
锛堬級