158点6乘7点3加1586乖零点27简便怎样做

5点半 half past five = five thirty
4点20 twenty past four = four twenty
9点45 a quarter to ten = fifteen to ten = nine forty-five
2点15 a quarter past two = fifteen past two = two fifteen
6点50 ten to seven = six fifty
4点40 twenty to five = four forty
7点15 a quarter past seven = fifteen past seven = seven fifteen
8点半 half past eight = eight thirty
注：’=‘ 意思是这两种或三种表达法是一样的,每个时间都有两种（有几个是三种）表达法