一到计算题a的3n次方=2,求(2a的2n次方)的3次方-(3a的n次方)的3次方
问题描述:
一到计算题
a的3n次方=2,求(2a的2n次方)的3次方-(3a的n次方)的3次方
答
a的3n次方=2
(2a的2n次方)的3次方-(3a的n次方)的3次方
=8a^(6n)-27a^(3n)
=8[a^(3n)]^2-27[a^(3n)]
=8*2^2-27*2
=32-54
=-22