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定义1:对于实数x,[x]表示不大于x的最大整数.称[x]为对实数x的取整运算. 定义2:对于实数x,规定{x}=x-[x],那么{x}是实数x的正的纯小数部分.
Definition 1: For a real number x, [x] represents the largest integer not greater than x. Let [x] be a rounding operation on the real number x. Definition 2: For a real number x, specify {x}=x-[x], then {x} is a positive pure fractional part of a real number x.