3x^2-[7x-(4x-2)-2x^2]计算

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：数学作业时间：2024/07/22 08:43:09

3x^2-[7x-(4x-2)-2x^2]
=3x^2-[7x-4x+2-2x^2]
=3x^2-[3x+2-2x^2]
=3x^2-3x-2+2x^2
=3x^2+2x^2-3x-2
=5x^2-3x-2
再问：（-x^2++4x）+(5x-4+2x^2)化简
再答：（-x^2+4x）+(5x-4+2x^2) =-x^2+4x+5x-4+2x^2 =2x^2-x^2+4x+5x-4 =x^2+9x-4
再问：是（-x^2+5+4x）+(5x-4+2x^2)化简
再答：（-x^2+5+4x）+(5x-4+2x^2) =-x^2+5+4x+5x-4+2x^2 =2x^2-x^2+4x+5x+5-4 =x^2+9x+1

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