3x²+{-2分之3x+3分之1y²}{2x-3分之2y}
=3x²-3x²+2/3 xy²+xy-2/9 y³
=2/3 xy²+xy-2/9 y³
= -2/9×4/9-2/9-2/9×8/27
= -2/9×(4/9 + 1 + 8/27)
= -2/9×47/27
= -94/243
3x²+{-2分之3x+3分之1y²}{2x-3分之2y}
=3x²-3x²+2/3 xy²+xy-2/9 y³
=2/3 xy²+xy-2/9 y³
= -2/9×4/9-2/9-2/9×8/27
= -2/9×(4/9 + 1 + 8/27)
= -2/9×47/27
= -94/243