1)6x^2y+2xy-3x^2y^2-5xy+4y^2x^2-6x^2y = x^2y^2-3xy2)(-3/2)*［(-2/3)^2-2］ =(-3/2)*(-2/3)^2-(-3/2)*2 =(-3/2)*4/9+3 =-2/3+3 =3/23)4x^2+3xy-x^2-9 =3x^2+3xy-9 =3*2^2+3*2*(-3)-9 =12-18-9 = -15
