已知x的m次=3,x的n次=6,求x的m-n次,x的3m-2n次的值
问题描述：
已知x的m次=3,x的n次=6,求x的m-n次,x的3m-2n次的值
答
∵x^m=3,x^n=6
∴x^(m-n)
=(x^m)/(x^n)
=3/6
=1/2
∴x^(3m-2n)
=[x^(3m)]/[x^(2n)]
=[(x^m)³]/[(x^n)²]
=3³/6²
=27/36
=3/4 谢谢。不客气~