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```
cpan -i Math::decNumber
```

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C:\> perl -MMath::decNumber="d_" -le "print d_(0.3) - d_(0.2) - d_(0.1
+);"
0.0

C:\>perl -MMath::decNumber="d_" -le "print sqrt(d_(3));"
1.732050807568877293527446341505872