作业帮3χ²－[7χ－﹙4χ－3﹚－2χ²]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 05:18:21
![3χ²－[7χ－﹙4χ－3﹚－2χ²]](/uploads/image/z/4519107-27-7.jpg?t=3%CF%87%26%23178%3B%EF%BC%8D%5B7%CF%87%EF%BC%8D%EF%B9%994%CF%87%EF%BC%8D3%EF%B9%9A%EF%BC%8D2%CF%87%26%23178%3B%5D)
3χ²－[7χ－﹙4χ－3﹚－2χ²]
3χ²－[7χ－﹙4χ－3﹚－2χ²]
3χ²－[7χ－﹙4χ－3﹚－2χ²]
3x²-（7x-4x+3-2x²）
=3x²-7x+4x-3+2x²
=5x²-3x-3
5x²-3x-3
3χ²－[7χ－﹙4χ－3﹚－2χ²]=3χ²-[7χ-4χ+3－2χ²]=3χ²-[3x+3－2χ²]=3χ²-3x-3+2χ²=5χ²--3x-3