①-2（1/3x-3/2y）²=-2[(1/3x)²-2*1/3x*3/2y+(3/2y)²]=-2/9x²+2xy-9/2y²②4（-3/2x-3y）（3/2x-3y）=-4(3/2x+3y)(3/2x-3y)=-4(9/4x²-9y²)=-9x²+36y²