3χ²-[7χ-﹙4χ-3﹚-2χ²]
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 23:04:15
![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