已知x^(2n)=5,求[1/3x^(3n)]^(2)-3*[x^(2)]^(2n)的值
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已知x^(2n)=5,求[1/3x^(3n)]^(2)-3*[x^(2)]^(2n)的值
已知x^(2n)=5,求[1/3x^(3n)]^(2)-3*[x^(2)]^(2n)的值
已知x^(2n)=5,求[1/3x^(3n)]^(2)-3*[x^(2)]^(2n)的值
解
原式
=1/9[x^(2n)]³-3×[x^(2n)]²
=1/9×5³-3×5²
=125/9-75
=550/75
=22/3
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