45°12′30″
=45°12.3‘
=45°+12.3÷60°
=45°+0.205°
=45.205°错了。。再算一次呃。。呵呵。45°12′30″ =45°12.5‘=45°+12.5÷60°=45°+0.2083°=45.2083°
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