Question

143°15′38〃+24°27′22〃;90°32″-46°20′52″；180°-（25°18′+65°56′）；28′3″×2+46.8°÷6

Answer 1

143°15′38″+24°27′22″
=(143°+24°)+(15′+27′)+(38″+22″)
=167°+42′+60″
=167°+42′+1′
=167°+43′
=167°43′

90°32″-46°20′52″
=89°60′32″-46°20′52″
=89°59′92″-46°20′52″
=(89°-46°)+(59′-20′)+(92″-52″)
=43°+39′+40″
=43°39′40″

180°-(25°18′+65°56′)
=180°-[(25°+65°)+(18′+56′)]
=180°-(90°+74′)
=180°-90°-74′
=90°-74′
=88°+(120′-74′)
=88°+46′
=88°46′

28′3″×2+46.8°÷6
=(28′×2)+(3″×2)+7.8°
=56′+6″+7°+0.8×60′
=56′+6″+7°+48′
=7°+(56′+48′)+6″
=7°+(60′+44′)+6″
=7°+60′+44′+6″
=7°+1°+44′+6″
=8°+44′+6″
=8°44′6″