解:(1)、3x²+(-3x/2+y²/3)(2x-2y/3)
=3x²-3x²+xy+2xy²/3-2y³/9
=xy+2xy²/3-2y³/9
=-1/3*2/3+2*(-1/3)*(2/3)²/3-2*(2/3)³/9
=-2/9-8/81-2/3*8/81
=-18/81-8/81
= - 26/81
解:(1)、3x²+(-3x/2+y²/3)(2x-2y/3)
=3x²-3x²+xy+2xy²/3-2y³/9
=xy+2xy²/3-2y³/9
=-1/3*2/3+2*(-1/3)*(2/3)²/3-2*(2/3)³/9
=-2/9-8/81-2/3*8/81
=-18/81-8/81
= - 26/81