计算 2(x²-x+1)-(-2x+3x²)+(1-x)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 13:07:23
![计算 2(x²-x+1)-(-2x+3x²)+(1-x)](/uploads/image/z/1987244-44-4.jpg?t=%E8%AE%A1%E7%AE%97+2%EF%BC%88x%26sup2%3B-x%2B1%29-%EF%BC%88-2x%2B3x%26sup2%3B%EF%BC%89%2B%EF%BC%881-x%EF%BC%89)
计算 2(x²-x+1)-(-2x+3x²)+(1-x)
计算 2(x²-x+1)-(-2x+3x²)+(1-x)
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)