(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2求答案
问题描述:
(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2求答案
答
(x^2+3)^2-2(x^2+3)(x+3)+(x+3)^2+(x^2-3)^2
=x^4+6x^2+9-2x^3-6x^2-6x-18+x^2+6x+9-x^4-6x^2+9
=-2x^3-5x^2+9