x^2+(x-2)^2-(2-x)^2+(x-1)^3+(1-x)^3=( )
问题描述:
x^2+(x-2)^2-(2-x)^2+(x-1)^3+(1-x)^3=( )
x^2+(x-2)^2-(2-x)^2+(x-1)^3+(1-x)^3=( )
答
x^2+(x-2)^2-(2-x)^2+(x-1)^3+(1-x)^3
=x^2+(x-2)^2-(x-2)^2+(x-1)^3-(x-1)^3
=x^2