计算 2(x²-x+1)-(-2x+3x²)+(1-x)

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/16 10:27:41

计算 2(x²-x+1)-(-2x+3x²)+(1-x)

2(x^2-x+1)-(-2x+3x^2)+(1-x)
=2x^2-2x+2+2x-3x^2+1-x
=-x^2-x+3

2(x²-x+1)-(-2x+3x²)+(1-x)
=2x²-2x+2+2x-3x²+1-x
=-x²-x+3
=-( x²+x-3)