a(a-2b)-(a-b)^2 (-1)^2+3^-2-(1/3)^0

问题描述:

a(a-2b)-(a-b)^2 (-1)^2+3^-2-(1/3)^0

a(a-2b)-(a-b)^2=a^2-2ab-(a^2-2ab+b^2)=a^2-2ab-a^2+2ab-b^2=-b^2
(-1)^2+3^-2-(1/3)^0=1+1/9-1=1/9