Question

若a的m次方=3，a的n次方=9，则a的（3m-2n）次方=？

.若a的m次方=3，a的n次方=9，则a的（3m-2n）次方=？

Answer 1

a的（3m-2n）次方
=a的3m次方÷a的2n次方
=(a的m次方)的3次方÷(a的n次方)的2次方
=27÷81
=1/3

Answer 2

a的（3m-2n）次方
=(a的m次方)^3/(a的n次方)^2
=3^3/9^2
=27/81
=1/3