1.(3a)^2 2.-(3a^2b^3)^3 3.(2*2分之1)^2*4^2 4.(-0.25)^12*4^12
问题描述:
1.(3a)^2 2.-(3a^2b^3)^3 3.(2*2分之1)^2*4^2 4.(-0.25)^12*4^12
5.0.5^2*2^5*0.125 6.(-a)^5/(-a) 7(-xy)^5/(-xy)^2 8.a^10n/a^2n 9.(-a)^5/a^2 7927^3/9^2 用幂的运算的逆向形式完成后面的题1.a^m+n 2.a^m-n 3.a^mn 4.a^n*b^n
答
(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