1.原式=176°240′
=180°
2.原式=100°+100′+85〃
=100°+101′+25〃
=101°+41′+25〃
3.原式=90°00′00〃-46°57′54〃
=43°2′6〃
4.原式=175°111′60〃÷3
=2653/15°÷3
=2653/45°
=58°57′20〃
累啊..