tmplinshi

@echo off
set "File=a.txt"
SetLocal EnableDelayedExpansion
(for /f "usebackq delims=" %%a in ("%File%") do (
    if "%%~xa"==".000000" (
        set var=%%~na
        set /a n1 = 680 + !random! %% 141, Total_n1 += n1
        set /a n2 = 680 + !random! %% 141, Total_n2 += n2
        if "!var:~0,1!"=="," set /a n1 = Total_n1 - n1, n2 = Total_n2 - n2
        for %%b in (!n1!) do (
            set var=!var:,0.000000=,%%b.000000!
            echo !var:~0,-1!!n2!.000000
        )
    ) else echo %%a
)) > "%File%_.txt"
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