4^m=2^2m,8^(m-1)=2^(3m-3),512=2^9
原式写为2^2m*2^(3m-3)/2^m=2^9
所以底数相同,指数进行加减运算2m+3m-3-m=9 m=3
4的m次方 =2的2m次方
8的m-1次方=2的3m-3次方
所以,512=2的(2m-3m-3-m)次方=2的(4m-3)次方
m=1
4^m*8^(m-1)/2^m=2^2m*2^(3m-3)/2^m=2^(2m+3m-3-m)=2^(4m-3)=512=2^9
∴4m-3=9
∴m=3
(4^m
*
8^(m-1))
/
2^m
=(2^2m
*
2^(3m-3))
/
2^m
=2^(2m+3m-3)/2^m
=2^(5m-3-m)
=2^(4m-3)
因为2^9=512
所以4m-3=9
所以m=3