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2x^6×x³-3x^9+5x²×x^7等于多少
人气:315 ℃ 时间:2019-11-16 17:37:41
解答

2x^6*x³-3x^9+5x²*x^7
=2x^9-3x^9+5x^9
=(2-3+5)x^9
=4x^9
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