![\sqrt[4]{7} \: . \: \sqrt{49} \\ = \sqrt[4]{7} \: . \: 7 \\ = {7}^{ \frac{1}{4} } \: . \: {7}^{ \frac{4}{4} } \\ = {7}^{ \frac{1}{4} + \frac{4}{4} } \\ = {7}^{ \frac{5}{4} }](/tpl/images/0668/1697/987c9.png)
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