$NumberMarks对选项 NumberMarks 给出缺省值,指定 标记是否应当包含在近似数的输入形式表示中.
$NumberMarks 的缺省值是 Automatic:
MachinePrecision 数不显示数标记:
任意精度数显示标记和精度:
暂时强制机器数字显示数标记:
NumberForm SetPrecision
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