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若x²y=3,求2xy(x的5次方y的2次方-3x³y-4x)的值
人气:126 ℃ 时间:2019-08-18 16:29:51
解答
原式=2x^6y³-6x^4y²-8x²y
=2(x²y)³-3(x²y)²-8(x²y)
=2×3³-3×3²-8×3
=3
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