(1)9的Y次方*3的3X次方
=3的2Y次方*3的3X次方
=3的3X+2Y次方
=3的-2次方
=1/9
(2)m-n+2n+1=11
{m-1+4-n=5
m+n=10
{m-n=2
m=6
{n=4