数值修约 Rounding
（重定向自Directed rounding）
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数值修约，又称数字修约，是指在进行具体的数字运算前，按照一定的规则确定一致的位数，然后舍去某些数字后面多余的尾数的过程。
Directed rounding
中文百科
英语百科
Rounding 数值修约
（重定向自Directed rounding）
Rounding a numerical value means replacing it by another value that is approximately equal but has a shorter, simpler, or more explicit representation; for example, replacing £23.4476 with £23.45, or the fraction 312/937 with 1/3, or the expression √2 with 1.414.
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