计算:(-3)的2n次方×(-1/3)的2n+1次方-2×(-1)的2n+1次方,其中n是正整数.
问题描述:
计算:(-3)的2n次方×(-1/3)的2n+1次方-2×(-1)的2n+1次方,其中n是正整数.
答
(-3)的2n次方×(-1/3)的2n+1次方-2×(-1)的2n+1次方
= (-3×(-1/3))^2n × (-1/3) - 2×(-1)
= -1/3 + 2
= 5/3