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已知x^2y=3,求2xy(x^5y^2-4x)的值
人气:312 ℃ 时间:2020-02-20 15:04:20
解答
2xy(x^5y^2-4x)
=2xy*x^5y^2-2xy*4x
=2x^6y^2-8x²y
=2(x²y)³-8x²y
=2×27-8×3
=30
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