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搜题/搜资源
【单选题】【消耗次数:1】
完全积性函数f(n)满足对于任意整数m,n都有[填空].
①
f(mn)=f(m)f(n)
②
f(mn)=f(m)+f(n)
③
f(m+n)=f(m)f(n)
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