第三句意思是这些数的乘积能被10整除,且除后不等于0.
你得这么想,0除以任何整数得0,如果四个数字里面有一个等于0 的话,那么,它们的乘积等于0,也能被0整除.所以,这第三句话的后半句想规定四个数字里面应该不包含0.
否则9810,是不是符合要求的最大的数呢?
前半句,能被10整除,必须有5和2两个数字了,8521?
数学题SATwhat is the greatest four-digit integer that 1.all of
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