摘要：3． 计算: (1) 2x4n÷x2n·(0.24xn) (2)3xy·2x4+7x2y(-x3)-(-x2y)·x2 (3) (4) (5)(6a5-7a2+36a3)÷3a2+2a(a2+a-6) (6)2(-xny)3·(-0.5xny2)3+0.75(x2ny3)3

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