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已知:x^2n=5,求(1/3x^3n)^2-3*(x^2)^2n的值
人气:425 ℃ 时间:2020-05-22 08:30:01
解答
[(1/3)x^3n]^2-3(x^2)^2n
= (1/9)x^6n-3x^4n
= (1/9)(x^2n)^3-3(x^2n)^2
= (1/9)*5^3-3*5^2
= -550/9
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