(3/2x²+xy-3/5y²)×(-4/3x²y²)
=3/2x²*（-4/3x²y²）+xy*(-4/3x²y²)-3/5y²*(-4/3x²y²)
= -2x^4y^2-4/3x^3y^3+4/5x^2y^4