Q1:( 3 x ^ 2 * y ) * (1/3- 6 x y + y ^ 3 )
=x^2y-18x^3y^2+3x^2y^4
Q2:( -1/2* xy )*(3x^2*y-2xy+y^2)
=-3/2x^3y^2+x^2y^2-1/2xy^3
Q3:(1/5ab)*(25a^2*b-2ab^2)
=5a^3b^2-2/5a^2b^3
Q1:( 3 x ^ 2 * y ) * (1/3- 6 x y + y ^ 3 )
=x^2y-18x^3y^2+3x^2y^4
Q2:( -1/2* xy )*(3x^2*y-2xy+y^2)
=-3/2x^3y^2+x^2y^2-1/2xy^3
Q3:(1/5ab)*(25a^2*b-2ab^2)
=5a^3b^2-2/5a^2b^3