62)if d is the positive integer and f is the product of the first 30 positive integers what is the value of d?
(1) 10d is a factor of f.
(2) d > 6
这个题目说d 是一个正整数,f 是30!阶乘,d的值多少,
这个题应该怎么推理?
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If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y,which multiple of 100 is closest to x+y? (1)x小于500 (2)y小于400