Solve these two questions:-
[i]What is the product of the expessions 5x^2y^3 and [1/5x^2 y-2x+3y]?
[ii]What will be the value of the product of 7xy^2,-3/7x^2z,-2/5yz^3 and 4/9xyz if x=2,y=3 and z=1?