例句與造句

1. Which of the followings is with 1 in the ( unit digit ) ?
   以下邊個數(shù)是用個1字作個位數(shù)呢？
2. If we multiply together all odd primes less than 100 , what will be the unit digit of the result
   若把所有小于100的奇質(zhì)數(shù)乘起來，所得結(jié)果的個位數(shù)字是甚麼？
3. It's difficult to find unit digit in a sentence. 用unit digit造句挺難的