90°17-47°52'2" 25°36'×4 48°2'÷5(急求)

问题描述:

90°17-47°52'2" 25°36'×4 48°2'÷5(急求)

90°17’-47°52'2"
=89°76‘60’‘-47°52’2‘’
=42°14‘58’‘
25°36'×4
=100°144’
=102°24‘
48°2'÷5
=45°180’120‘’÷5
=9°36‘24’‘