计算:6x^2-[-3x^2-(x-1)]

问题描述:

计算:6x^2-[-3x^2-(x-1)]

6x^2-[-3x^2-(x-1)]=6x^2+3x^2+x-1=9x^2+x-1
先去括号,再合并同类项.去特号时注意符号是否改变.