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标题: prep 数学？ [打印本页]

作者: cindytim 时间: 2009-12-26 11:14
标题: prep 数学？

If 500 is the multiple 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<500

2). Y<400

答案是e，题目这表达在说什么啊，请nn帮我下

作者: cindytim 时间: 2009-12-26 12:07
我搞明白了，题目是在问100与某个数的乘积等于500，这个乘积四舍五入最接近500的。那也就是450>X>500

如果有牛牛更好的解释也上来给我讲解下哈

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