摘要：计算: a3b4c·3a2b4; (2)(-4x2+12x2y2-16x4y3)(-2x)2; 3(b3)2÷4a3b4; (4)(-8a4b5c÷4ab5)(-3a3b2). (1)答案:-45a5b8c. 提示:把系数和相同字母分别结合,再计算.(-15)a3b4c·3a2b4=-45a3+2b4+4c=-45a5b8c. (2)答案:-16x4+48x4y2-64x6y3. 提示:先乘方,再用分配律.(-4x2+12x2y2-16x4y3)(-2x)2=(-4x2+12x2y2-16x4y3)4x2=-4x2×4x2+12x2y2×4x2-16x4y3×4x2=-16x4+48x4y2-64x6y3. (3)答案:2b2. 提示:先乘方,再乘除.(2a)3(b3)2÷4a3b4=8a3b6÷4a3b4=2b2. (4)答案:6a6b2c. 提示:先确定结果符号.(-8a4b5c÷4ab5)(-3a3b2)=-2a3c(-3a3b2)=6a6b2c.

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