若x^m=9,x^n=6,x^k=4,求x^m-2n+2k的值
问题描述：
若x^m=9,x^n=6,x^k=4,求x^m-2n+2k的值
答
答：
x^m=9,x^n=6,x^k=4,
所以：
x^(m-2n+2k)
=(x^m)÷[(x^n)^2]×[(x^k)^2]
=9÷6²×4²
=9×16÷36
=4