The question depends on whether you mean the base is a fraction or the power. It is not clear from the question and the answer will depend on which it is.
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The laws of exponents work the same with rational exponents, the difference being they use fractions not integers.
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Uranus's gravity is far stronger than earths.
This is effectively the same as lining up the decimal points when adding or subtracting ordinary decimal fractions.
you do not do anything when you add numbers with exponents. you just figure out the answer. it is only if you multiply numbers with exponents, where you add the exponents..