原式=(2b+c)(3a-2b)(9a²+6ab+4b²)-(3a-2b)(2b+c)(4b²-bc+c²)=(2b+c)(3a-2b)(9a²+6ab+4b²-4b²+bc-c²)=(2b+c)(3a-2b)(9a²+6ab+bc-c²)〔(3a)^3-(2b)^3〕和〔(2b)^3+c^3〕这么快速分解啊立方差和立方和不懂x³-y³=(x-y)(x²+xy+y²)x³+y³=(x-y)(x²-xy+y²)采纳吧把这个给忘了sorry