2x^2y.4x^4y^3/6x^6y^6

Answer 1

do you mean?

2x^2 y 4x^4 y^3 / (6x^6 y^6) ???

(8/6) x^(2 +4-6) y^(3-6)

(4/3)/y^3
or
4/(3y^3)