Question

a的m次方等于4,a的n次方等于5,求a的3m次方减去2n次方等于多少

Answer 1

a^m=4

a^n=5

a^(3m)-a^(2n)

=(a^m)³-(a^n)²

=4³-5²

=64-25

=39

注：a^m——表示a的m次方