谁帮我解释一下这句话,数学里的

阿窈

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?

阿窈

没人理我啊

xz328

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?

-- by 会员 阿窈 (2009/11/11 19:59:22)

500是100的倍数里最靠近x的，400是100的倍数里最靠近y的，问100的几倍是最靠近x+y的？ 答案应该是900吧。前者的范围是451~549，后者范围351~449.加起来 802~998，这个区间内100的倍数只有900.