if [a] indicates the greatest integer less than a,then

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if [a] indicates the greatest integer less than a,then
If [a] indicates the greatest integer less than a,then ( ) (A)a-1

如果[a]表示不大于a的最大整数那么：
所以 a-1一定小于或等于[a],[a]也一定小于a
道理很简单,例如：a=10 则[a]=10 ,a=10.1 则[a]=10

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