已知X的M次幂=6,X的N次幂=3,则X的2-3N次幂的值为多少?B4/3 C2 D3/4
问题描述：
已知X的M次幂=6,X的N次幂=3,则X的2-3N次幂的值为多少?
B4/3 C2 D3/4
答
X^M=6,X^N=3,
X^(2M-3N)
=X^2M/X^3N
=(X^M)^2/(X^N)^3
=36/27
=4/3
选B.