16^m=4*2^(2n-2)(2^4)^m=2^2*2^(2n-2)2^4m=2^(2n-2+2)4m=2n2m=n----------------------(1)式27^n=9*3^(m+3)(3^3)^n=(3^2)*3^(m+3)3^3n=3^[2+(m+3)]3n=m+5----------------------(2)式根据(1)式和(2)式可解出m、nm=1n=2