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数学
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(-2x)^4-(-3x²)²-[-(4x²)²]+3(-x)³·x
人气：404 ℃ 时间：2019-10-11 21:40:02
解答
=(2x)^4-(3x²)^2+(4x²)^2-3x^4
=16x^4-9x^4+16x^4-3x^4
=21x^4
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