计算:①(16a3-8a2-4a)÷4a=________;②0.252008×42009=________.
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4a2-2a-1 4
解析分析:①利用多项式除以单项式的法则即可求出结果;
②先逆用同底数幂的乘法运算性质将42009改写成42008×4,再根据乘法的结合律将0.252008与42008结合,逆用积的乘方运算性质,得出0.252008×42008=(0.25×4)2008=1,进而得出结果.
解答:①(16a3-8a2-4a)÷4a=4a2-2a-1;②0.252008×42009,
=0.252008×42008×4,
=(0.25×4)2008×4,
=1×4,
=4.
故