àn / zhào / shù / xué / guī / zé / xiǎo / shù / diǎn / hòu / yí / wèi / shì / wǔ / shí / yào / sì / shě / wǔ / rù

按照数学规则，小数点后一位是五时要四舍五入。

According to mathematical rules, a digit of five in the first decimal place is rounded.