题目内容
【题目】已知n是正整数,且x3n=2,求(3x3n)3+(-2x2n)3的值.
【答案】184
【解析】试题分析:根据幂的乘方以及积的乘方运算法则将原式变形为27(x3n)3-8(x3n)2,从而求出答案.
试题解析:
(3x3n)3+(-2x2n)3=33×(x3n)3+(-2)3×(x3n)2=27×8+(-8)×4=184.
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