请问数学老师 条件中 each more than 3 feet from the nearest wall 这个条件有什么用?再说下思路 谢谢老师
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ken@boost.org.cn
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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