问题标题：
救命!byrewritingeachpartoftheexpressionsandthenusingindexlaws,reduceeachofthefollowingtosimplestfroma）9^3/3^Nb)4^2n/2^3乘以2^n+1/8c)25/5^n+1乘以5^2n/125
更新时间:2024-05-14 16:00:11
问题描述：
救命!
byrewritingeachpartoftheexpressionsandthenusingindexlaws,reduceeachofthefollowingtosimplestfrom
a）9^3/3^N
b)4^2n/2^3乘以2^n+1/8
c)25/5^n+1乘以5^2n/125
陈祥光回答：
重写多项式,把它们简化了
又不是选择题,选什么A
a)
3^6/3^N
=3^(6-N)
b)
2^2n/2^3×2^(n+1)/2^3
=2^(2n-3)×2(n-2)
=2^(3n-5)
c)
5^2/5^(n+1)×5^2n/5^3
=5^(1-n)×5(2n-3)
=5^(n-2)
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