作业帮化简：3a²-[7a-3(4a-3)-2a²]
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/17 23:57:34
![化简：3a²-[7a-3(4a-3)-2a²]](/uploads/image/z/659616-24-6.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A3a%26%23178%3B-%5B7a-3%284a-3%29-2a%26%23178%3B%5D)
x){3{f')[XF'k M]#`MR>j lH3%p5@5Fږp*aڦ9S!<;CZJR
化简：3a²-[7a-3(4a-3)-2a²]
化简：3a²-[7a-3(4a-3)-2a²]
化简：3a²-[7a-3(4a-3)-2a²]
3a²-[7a-3(4a-3)-2a²]
=3a²-(7a-12a+9-2a²)
=3a²+2a²+5a-9
=5a²+5a-9