計(jì)算:①123°29′29〞+69°46′53〞=________;②41°16′37〞×5=________.
193°16′22″ 206°23′5″
分析:①兩個(gè)度數(shù)相加,度與度,分與分,秒與秒對(duì)應(yīng)相加,秒的結(jié)果若滿(mǎn)60,則轉(zhuǎn)化為分,分的結(jié)果若滿(mǎn)60,則轉(zhuǎn)化為度.
②先讓度、分、秒分別乘5,秒的結(jié)果若滿(mǎn)60,轉(zhuǎn)換為1分;分的結(jié)果若滿(mǎn)60,則轉(zhuǎn)化為1度.
解答:①123°29′29〞+69°46′53〞=193°16′22″;
②41°16′37〞×5=205°80′185″=206°23′5″.
故答案為193°16′22″;206°23′5″.
點(diǎn)評(píng):本題考查了度、分、秒的加法,乘法計(jì)算.進(jìn)行度、分、秒的加法計(jì)算,注意以60為進(jìn)制即可;度、分、秒的乘法計(jì)算,應(yīng)讓度、分、秒分別乘所給因數(shù),看分或秒哪個(gè)滿(mǎn)60,向前進(jìn)1即可.