3a^n+2+15a^n-1-45a^n
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a^n+2+a^n+1-3a^n因式分解
3a^n+2+15a^n-1-45a^n
解因式3a^n+2+15a^n+1-45a^n
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3a^(n+2) +15a^(n-1) - 45a^n 因式分解题 帮忙 分不多了
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