Question

已知3的M次方等于5,3的N次方等于2,求3的2M减3N加1的值

Answer 1

3^(2m-3n+1)

=3^(2m)x3^(-3n)x3

=(3^m)^2x(3^n)^(-3)x3

=5^2x2^(-3)x3

=25x(1/8)x3

=75/8