108°54′-79°32′= 77°42′+34°45′=

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108°54′-79°32′=77°42′+34°45′=108°54′-79°32′=77°42′+34°45′=108°54′-79°32′=77°42′+34°45′=108°54′-79°32

108°54′-79°32′= 77°42′+34°45′=
108°54′-79°32′= 77°42′+34°45′=

108°54′-79°32′= 77°42′+34°45′=
108°54′-79°32′
不用退位,直接度相减、分相减就行了
= 29°22‘
77°42′+34°45′
=111°87’
60‘=1°,这里需进位
=112°27’