if the average of the consecutive even integers a,b, and c is less than 13a, which of the following best describes the value of a?
答案: a is positive
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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