500 is the multiple of 100 that is closest to X, 400 is the multiple of 100 that is closest to Y, Which multiple of 100 is closest to X+Y?
看不懂题目啥意思啊
500 是 100的倍数, 几倍呢, that is closest to x
400 是 100的倍数, 几倍呢, that is closest to y
多少 是 100 的 倍数, 几倍呢, x+y 倍
900呗
500是100的倍数,that 定从就近修饰multiple,意思是这个倍数是所有100的倍数中最接近X的 所以450<x<550
同理,400是100的倍数中最接近Y的
问100的哪个倍数最接近x+y
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