3的英文为three，二进制表示为11。 汉字“三”是指事字，本义表示数目二加一的和。 数字3作为阿拉伯数字起源于古印度，在公元前三世纪已有应用，约公元7世纪传到阿拉伯地区，13世纪传入欧洲时被误 … 3HK - Beyond Hong Kong! Travel has become part of everyday life. The brand new "WORLD PLAN" One monthly fee - enjoy data from Hong Kong to the world! Explore the hidden properties of 3, an odd prime number. Includes Prime Factorization, Divisors, Bases and Fun Facts for students, number lovers and curious minds. 3 is the only integer which is the sum of the preceding positive integers (1+2=3) and the only number which is the sum of the factorials of the preceding positive integers (1!+2!=3). 了解 Model 3，一款兼具高性能和经济性的中型电动轿车，加速快、续航里程长且使用成本低。