已知a的m次方=3,a的n次方=2,求a的2m-3n次方的值..
问题描述:
已知a的m次方=3,a的n次方=2,求a的2m-3n次方的值..
答
a的2m-3n次方=a^2m/a^3n=(a^m)^2/(a^n)^3=9/8
答
a的2m-3n次方=a^(2m)÷a^(3n)=(a^m)^2÷(a^n)^3=9/8
答
a^2m-3n
=a^2m÷a^3n
=(a^m)²÷(a^n)³
=3²÷2³
=9÷8
=9/8