继续请教PREP题（2）---目标很宏伟，要51！

slfxiaobai

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 小于500
2）y小于400
Key:E

这题，我想自己也是没理解到题目...完全不知道它究竟想要什么...

justeva

将x\y均取整到百位，x约为500，y约为400，x+y取整到百位约为多少？

slfxiaobai

呀...我自个顶上去...大家帮帮忙啊。