(3x-2)(2x-3)=(6x-5)(x-1)+15
——》6x^2-13x+6=6x^2-11x+5+15
——》x=-7;
1、原式=-10xy*(2x^2-3xy^2)=30x^2y^3-20x^3y;
2、原式=2x^2y+3xy-x^2y=x^2y+3xy;
3、原式=6a^3-27a^2+9a-8a^2+4a=6a^3-35a^2+13a;
4、原式=4x^4*(-27x^3)=-108x^7;
5、原式=x^2-x+2x^2+2x-6x^2+17x-5
=-3x^2+18x-5
=-3*4+18*2-5
=19.