-3a^n(a^n-1+2a^n-2+3a^n-3)+a^n-2(a^n-1-a^n+4a^n+1)超有挑战的因式分解!哪为天才能帮我?我以做出,但感觉答案不对.请求高人赐教!
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-3a^n(a^n-1+2a^n-2+3a^n-3)+a^n-2(a^n-1-a^n+4a^n+1)超有挑战的因式分解!哪为天才能帮我?我以做出,但感觉答案不对.请求高人赐教!-3a^n(a^n-1+
-3a^n(a^n-1+2a^n-2+3a^n-3)+a^n-2(a^n-1-a^n+4a^n+1)超有挑战的因式分解!哪为天才能帮我?我以做出,但感觉答案不对.请求高人赐教!
-3a^n(a^n-1+2a^n-2+3a^n-3)+a^n-2(a^n-1-a^n+4a^n+1)
超有挑战的因式分解!哪为天才能帮我?我以做出,但感觉答案不对.请求高人赐教!
-3a^n(a^n-1+2a^n-2+3a^n-3)+a^n-2(a^n-1-a^n+4a^n+1)超有挑战的因式分解!哪为天才能帮我?我以做出,但感觉答案不对.请求高人赐教!
-3a^n(a^n-1+2a^n-2+3a^n-3)+a^n-2(a^n-1-a^n+4a^n+1)
=a^(n-2)[-3a^2(a^(n-1)+2a^(n-2)+3a^(n-3))+(a^(n-1)-a^n+4a^(n+1))]
=a^(n-2)[-3a^(n-1)(a^2+2a+3)+a^(n-1)(1-a+4a^2)]
=a^(2n-3)[-3(a^2+2a+3)+(1-a+4a^2)]
=a^(2n-3)(a^2-7a-8)
=a^(2n-3)(a+1)(a-8)
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n(n+1)+(n+1)(n+2)+(n+2)(n+3).(n+2a)(n+2a+1)用一个代数式表示谢谢schumiandmassa 与guoshiqiangaxv的回答,
n边形所有对角线的条数是A n(n-1)/2 B n(n-2)/2 C n(n-3)/2 D n(n-4)/2