3的2n次方等于5,3的m次方等于10,求9的2m-n次方
发布网友
发布时间：2022-05-02 06:45
共1个回答
热心网友
时间：2022-06-29 06:13
=9^m/9^n
=3^2m/(3^n)^2
=5/10^2
=5/100
=0.05
9^(2m-n)
=9^2m/9^n
=(3^2m)^2/(3^n)^2
=5^2/10^2
=25/100
=0.25
答案等于0.25
