103.3°+176°42'-98.34°怎么算.要过程 还有24°22'36"×3 怎么算 147°45’÷5怎么算啊.求过程

103.3°+176°42′-98.34°
=103.3°+[176°+(42/60)°]-98.34°
=103.3°+176.7°-98.34°
=280°-98.34°
=181.66°
=181°+(0.66×60)′
=181°+39.6′
=181°+39′+(0.6×60)″
=181°+39′+36″
=181°39′36″
24°22′36″×3
=(24°+22′+36″)×3
=24°×3+22′×3+36″×3
=72°+66′+108″
=72°+60′+6′+60″+48″
=73°+7′+48″
=73°7′48″
147°45′÷5
=(147°+45′)×1/5
=(145°+120′+45′)×1/5
=(145°+165′)×1/5
=145°×1/5+165′×1/5
=29°+33′
=29°33′