问题
解答题
计算:sin60°×cos30°+cos60°×sin30°+tan45°.
答案
sin60°×cos30°+cos60°×sin30°+tan45°
=
×3 2
+3 2
×1 2
+1(3分)1 2
=2.(4分)
计算:sin60°×cos30°+cos60°×sin30°+tan45°.
sin60°×cos30°+cos60°×sin30°+tan45°
=
×3 2
+3 2
×1 2
+1(3分)1 2
=2.(4分)