判断一个数能否被３整除，一般是把这个数的各位上的数字相加，然后看它的和能否被３整除。如果和能被３整除，则这个数能被３整除。对于数位较少、数位上数字都较小的数，此法挺简便，但对于数位较多、数位上数字都较大的数，此法就显得麻烦了。下面介绍一种判断数位较多... To determine whether a number can be divisible by 3, the general is to add the figures on this number, and then see if its sum can be divided by 3. If and can be divisible by 3, then this number can be divided by 3. This method is simple and convenient for a few digits and a small number of digits. However, this method becomes troublesome for numbers with more digits and larger digits. The following describes a judge more digital ...