Question

y^4 : y умножить на(y^2)^3

Answer 1

 y^3(y^2)^3=у^3* y^6=y^9          

Answer 2

$frac{y^4}{y*(y^2)^3} = frac{y^4}{y*y*6} = frac{y^4}{y^7} = frac{1}{y^3}$