If r and s are positive integers, can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?
1 s is a factor of 100
2 r is a factor of 100
答案是A 这种题应该什么思路? 不太会,答案没看懂。。。谢谢
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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