问题
解答题
计算:
(1)180°-(78°36′+26°40′).
(2)21°17′×5.
答案
(1)原式=180°-105°16′
=74°44′;
(2)原式=21°×5+17′×5
=105°85′
=106°25′.
计算:
(1)180°-(78°36′+26°40′).
(2)21°17′×5.
(1)原式=180°-105°16′
=74°44′;
(2)原式=21°×5+17′×5
=105°85′
=106°25′.