|a|=\sqrt 13 |b|=\sqrt 13 |6a^4b|

请输入您的数学问题…… |a|=\sqrt 13 |b|=\sqrt 13 |6a^4b|

问题

∣ a ∣ = 1 3∣ b ∣ = 1 3∣6 a^{4} b ∣

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