The temperature range is between 38.9 ℃ and 41.1 ℃

The temperature range is between 38.9 ℃ and 41.1 ℃

（38.9+41.1）÷2=40℃
40-38.9=1.1℃
[answer] 40 ℃± 1.1 ℃

A certain kind of medicine must be stored at the specified temperature. If the instruction indicates 20 positive three negative two 9 (℃), what is the storage temperature range of the medicine?
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I can't understand this. According to the Pharmacopoeia, the temperature is 10-30 ℃ at normal temperature, 2-10 ℃ in cold place, 20 ℃ in dark place, and no more than 20 ℃ in dark place. You can call the manufacturer. If you make a mistake, there is another regulation. Anyway, I don't think it's standard,

Calculation: 3.41 × 9.9 × 0.38 △ (0.19 × 33 / 10 × 1.1)
The writing process should be simple

3.41×9.9×0.38÷（0.19×33/10×1.1）
=3.41÷1.1 X 9.9÷3.3 X 0.38÷0.19
=3.1X3X2
=3.1X6
=18.6