Плюс два или минус два?

Apr. 15th, 2016 10:21 pm
zorgeo: (Default)
[personal profile] zorgeo
Скажите, пожалуйста, чему равно sqrt(-4)*sqrt(-9)?

А то у меня возникли некоторые разногласия.

Потом расскажу анекдот в сабже.
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