153度19'42"+26度40'28"和90度3"-57度21'44" 等于多少比如28"=?'+?度

153°19'42"+26°40'28"
=(153+26)°(19+40)'(42+28)"
=179°59'70"
=179°60'10"
=180°10";
90°3"-57°21'44"
=89°59'63-57°21'44"
=(89-57)°(59-21)'(63-44)"
=32°38'19".

153度19'42"+26度40'28=180度10"
90度3"-57度21'44"=32度38'19"
都是60进制的