若3^m=4,9^n=5,则3^(3m-4n)
1个回答
若3^m=4,
9^n=5,即3^2n=5,(3^n)^2=5
那么,
3^(3m-4n)
=(3^m)^3/(3^n)^4
=4^3/5^2
=64/25
相关问题
若3x^3m+5n+9 +9y^4m-2n+3=5是二元一次方程,则m除n等于
集合M={4,5,-3m},N={-9,3} 若M∩N≠∅,m的值为?
(2012•惠州模拟)集合M={4,5,-3m},N={-9,3},若M∩N≠∅,则实数m的值为( )
2m-3n/3m+5n=3 则(4m-6n/18m+30n)+9m+15n/4m-6n的值是多少
若|m-n|=n-m,且|m|=4,|n|=3,则(m+n²)=______
若3m-n=-2,3m+n=5,则9m²-n²的值为_______.
1若m=n,则|m|=|n|;2若m=—n,则|m|=|n|;3若|m|=|n|,则m=—n;4若|m|=|n|,则m=
若m-n=5,m+n=9,则2n^3-mn=___
若4∧m=3,8∧n=5,求2∧4m+9n的值
若2m+3n=4,则4^m*8^n=