机长哥哥
幼苗
共回答了17个问题采纳率:94.1% 举报
90°-47°32′48″
=89°59′60″-47°32′48″
=(89°-47°)+(59′-32′)+(60″-48″)
=42°+27′+12″
=42°27′12″
54°43′36″×2
=(54°+43′+36″)×2
=54°×2+43′×2+36″×2
=108°+86′+72″
=108°+60′+26′+60″+12″
=108°+1°+26′+1′+12″
=109°+27′+12″
=109°27′12″
1年前
4