有人用东京热做铃声吗:(a+1)(a-2)(a-3)(a-6)-a^2(a+5)^2

来源:百度文库 编辑:中科新闻网 时间:2024/05/01 07:25:53
写出过程,谢谢!

(a+1)(a-2)(a-3)(a-6)-a^2(a+5)^2
=(a^2-5a-6)(a^2-5a+6)-a^2(a+5)^2
=(a^2-5a)^2-36-a^2(a+5)^2
=-36

(a+1)(a-2)(a-3)(a-6)-a^2(a+5)^2
=[(a+1)(a-6)][(a-2)(a-3)]-a^2(a+5)^2
=(a^2-5a-6)(a^2-5a+6)-a^2(a+5)^2
=a^2(a-5)^2-36-a^2(a+5)^2
=a^2[(a-5)^2-(a+5)^2] -36
=a^2(-20a)-36
=-20a^3-36