107°-52°32′30〃 =106°59′60〃 -52°32′30〃 =106-52°59-32′60-30〃=54°27′30〃39°48′＋47°37′=39+47°48+37′=86°85′=86°60+25′=87°25′25°36′24〃×4 =25×4°36×4′24×4〃=100°144′96〃...