90度减36度21分是多少?
解答如下
90°-36°21′
=89°60′-36°21′
=(89-36)°(60-21)′
=53°39′
或者:
90°-36°21′
=90°-36°-21′
=54°-21′
=53°60′-21′
=53°(60-21)′
=53°39′
或者:
90°-36°21′
=90°-36°-21′
=90°-36°-(21/60)°
=90°-36°-(7/20)°
=90°-36°-0.35°
=90°-36.35°
=53.65°
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