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当a=-1时,式子-5a^n-a^n+8a^n-3a^n-a^(n+1)(n是正整数)等于多少
人气:311 ℃ 时间:2020-05-02 11:27:07
解答
-5a^n-a^n+8a^n-3a^n-a^(n+1)
=-a^n-a^(n+1)
=-a^n*(a+1)
当a=-1时,a+1=0.所以
-5a^n-a^n+8a^n-3a^n-a^(n+1)=0
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