10x^6y^3 + 20x^3y^2 / 5x^3y = 5x^3y (2x^3y^2 + 4y) / 5x^3y= <span>2x^3y^2 + 4y </span> First you find what the expressions 10x^6y^3 and 20x^3y^2 have in common, and that is 5x^3y, which is the same as the denominator, so you can easily divide them and get 1. <span>Hope you understand!
