СРОЧНООО...Представьте в виде дроби выражения
a)а^2/12b^3*4b^5/a^6=
б)21х^3/у^2:(14х^2у)=
в)(а+2+а^2/1-а)*1-2а+а^2/а+2=
3 пример по действиям...
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