3x^2-[7x-(4x+2)+2x^2]-x^2 化简结果是-3x+2吗?

问题描述:

3x^2-[7x-(4x+2)+2x^2]-x^2 化简结果是-3x+2吗?

3x^2-[7x-(4x+2)+2x^2]-x^2
=3x^2-[7x-4x-2+2x^2]-x^2
= 3x^2-7x+4x+2-2x^2-x^2
=-7x+4x+2
=-3x+2

3x^2-[7x-(4x+2)+2x^2]-x^2
=3x^2-7x+(4x+2)-2x^2-x^2
=3x^2-7x+4x+2-2x^2-x^2
=-3x+2