I would say just like you add and subtract regular fractions. (Remember that the bases have to be the same. You can't add or subtract the exponents in something like a^1/2 x b^1/3.) Examples: 1.) y^1/3 x y^1/2 = y(1/3 + 1/2) = y^5/6. 2.) (y^5/6)/(y^1/3) y(5/6 - 1/3) = y^3/6 = y^1/2. Comment if you have a question. read more
Video: Addition & Subtraction of Rational Exponents In this lesson, we'll talk about how you can add and subtract numbers that have rational exponents. You'll learn what things your exponents need to have in common before you can combine them by adding or subtracting. read more