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{1} 53°9′+25°4+′38′′
{2} 90°-37°42′38′′
{3} 25°53′28′′×5
{4} 15°20′÷6
{1} 53°9′+25°4′38′′
=78°13′38′′
{2} 90°-37°42′38′′
=89°59′60′′-37°42′38′′
=52°17′22′′
{3} 25°53′28′′×5
=125°265′140′′
=125°267′20′′
=129°27′20′′
{4} 15°20′÷6
=920'/6
=153又3分之1′
=153′20"
=2°33′20"
{2} 90°-37°42′38′′
{3} 25°53′28′′×5
{4} 15°20′÷6
{1} 53°9′+25°4′38′′
=78°13′38′′
{2} 90°-37°42′38′′
=89°59′60′′-37°42′38′′
=52°17′22′′
{3} 25°53′28′′×5
=125°265′140′′
=125°267′20′′
=129°27′20′′
{4} 15°20′÷6
=920'/6
=153又3分之1′
=153′20"
=2°33′20"
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