(-2x^2y^3)^2*（xy）^3
=4x^4y^6*x^3y^3
=4x^7y^9
3x^3-(x^2+2x)(3x-1)-3(x+5)(x-2)
=3x^3-3x^3+x^2-6x^2+2x-3x^2-9x+30
=-8x^2-7x+30