Remove the negative exponent.

If <math><mstyle displaystyle="true"><mi>n</mi></mstyle></math> is a positive integer that is greater than <math><mstyle displaystyle="true"><mi>x</mi></mstyle></math> and <math><mstyle displaystyle="true"><mi>a</mi></mstyle></math> is a real number or a factor, then <math><mstyle displaystyle="true"><msup><mrow><mi>a</mi></mrow><mrow><mfrac><mrow><mi>x</mi></mrow><mrow><mi>n</mi></mrow></mfrac></mrow></msup><mo>=</mo><mroot><mrow><msup><mrow><mi>a</mi></mrow><mrow><mi>x</mi></mrow></msup></mrow><mrow><mi>n</mi></mrow></mroot></mstyle></math> .

Use the rule to convert <math><mstyle displaystyle="true"><mfrac><mrow><mn>1</mn></mrow><mrow><msup><mrow><mi>y</mi></mrow><mrow><mfrac><mrow><mn>8</mn></mrow><mrow><mn>7</mn></mrow></mfrac></mrow></msup></mrow></mfrac></mstyle></math> to a radical, where <math><mstyle displaystyle="true"><mi>a</mi><mo>=</mo></mstyle></math> , <math><mstyle displaystyle="true"><mi>x</mi><mo>=</mo></mstyle></math> , and <math><mstyle displaystyle="true"><mi>n</mi><mo>=</mo></mstyle></math> .

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