98度30分24秒等于多少度

98°30′24″
=98°+(30/60)°+(24/3600)°
=98°+0.5°+0.0067°
=98.5067°
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98°30′42″
=98°30′+（42÷60）′
=98°30′+0.7′
=98°+30.7′
=98°+（30.7÷60）°
=98°+0.51°
=98.51°