14°28'+42°42' 90°-30°15'20'' 55°28'+42°32'-13°27' 15°51'×2
问题描述：
14°28'+42°42' 90°-30°15'20'' 55°28'+42°32'-13°27' 15°51'×2
答
14°28'+42°42' =56°60'=57°
90°-30°15'20'' =89°59'60''-30°15'20'' =59°44'40''
55°28'+42°32'-13°27' =97°60'-13°27' =84°33'
15°51'×2=30°102'=31°42