罗斯50佳球:(a+1)(a-2)(a-3)(a-6)-a^2(a+5)^2

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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