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並前往http://support.ptc.com/help/mathcad/en/PTC_Mathcad_Help/truncation_and_rounding_functions.html

Truncation and Rounding Functions

round(z, [n])—Returns z rounded to n decimal places. ... If the (n + 1)th decimal place is less than 5, the number is rounded down, otherwise, it is rounded ...

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