80°32′15″+90°27′45″ 100°-36°18′52″ 54°36′18″×三分之二 57°30′÷5 过

80°32′15″+90°27′45″
=(80°+90°)+(32′+27′)+(15″+45″)
=170°+59′+60″
=170°+59′+1′
=170°+60′
=170°+1°
=171°
100°-36°18′52″
=99°59′60″-36°18′52″
=(99°-36°)+(59′-18′)+(60″-52″)
=63°+41′+8″
=63°41′8″
54°36′18″×2/3
=54°×2/3+36′×2/3+18″×2/3
=36°+24′+12″
=36°24′12″
57°30′÷5
=(55°+2°+30′)×1/5
=(55°+120′+30′)×1/5
=(55°+150′)×1/5
=55°×1/5+150′×1/5
=11°+30′
=11°30′

80°32′15″+90°27′45″
=(80°+90°)+(32′+27′)+(15″+45″)
=170°+59′+60″
=170°+59′+1′
=170°+60′
=170°+1°
=171°
100°-36°18′52″
=99°59′60″-36°18′52″
=(99°-36°)+(59′-18′)+(60″...