-x^3-(3x^2+2x+2)-(x^3-2x+4)
=-x^3-3x^2-2x-2-x^3+2x-4
=-2x^3-3x^2-6
8(ab-3a^2)-5ab-2(3ab-2a^2)
=8ab-24a^2-5ab-6ab+4a^2
=-3ab-20a^2
都有错误
看好符号
内个,刚刚学的“整式的加减”有点晕,所以想请大家帮我看看我写的对不对,
-x^3-(3x^2+2x+2)-(x^3-2x+4)
=-x^3-3x^2-2x-2-x^3+2x-4
=-2x^3-3x^2-6
8(ab-3a^2)-5ab-2(3ab-2a^2)
=8ab-24a^2-5ab-6ab+4a^2
=-3ab-20a^2
都有错误
看好符号