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![243^{1,2}=243^{1\frac{2}{10}}=243^{1\frac{1}{5}}=243^{1+\frac{1}{5}}=243^1\cdot243^\frac{1}{5}=243\sqrt[5]{243}\\\\=243\sqrt[5]{3^5}=243\cdot3=729](/tpl/images/0746/7227/b7fad.png)
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