(3a)^2=9a^2
-(3a^2b^3)^3=-27a^6b^9
(2*1/2)^2*4^2=16
(-0.25)^12*4^12=(-0.25*4)^12=1
0.5^2*2^5*0.125=(1/2)^2*2^5*(1/2)^3=2^(-5)*2^5=1
(-a)^5/(-a)=(-a)^4=a^4
(-xy)^5/(-xy)^2=-(xy)^5/(xy)^2=-(xy)^3=-x^3y^3
a^10n/a^2n=a^8n
(-a)^5/a^2=-a^3
7927^3/9^2=?——27^3/9^2=3^9/3^4=3^5
a^(m+n)=a^m*a^n
a^(m-n)=a^m/a^n
a^(mn)=(a^m)^n
a^n*b^n=(ab)^n