3(a²-1)-2(a+1-a²)等于多少我少打了一个是3(2a²-1)-2(a+1-a²)对不起哈
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![3(a²-1)-2(a+1-a²)等于多少我少打了一个是3(2a²-1)-2(a+1-a²)对不起哈](/uploads/image/z/1999148-68-8.jpg?t=3%28a%26%23178%3B-1%29-2%28a%2B1-a%26%23178%3B%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%E6%88%91%E5%B0%91%E6%89%93%E4%BA%86%E4%B8%80%E4%B8%AA%E6%98%AF3%282a%26%23178%3B-1%29-2%28a%2B1-a%26%23178%3B%EF%BC%89%E5%AF%B9%E4%B8%8D%E8%B5%B7%E5%93%88)
3(a²-1)-2(a+1-a²)等于多少我少打了一个是3(2a²-1)-2(a+1-a²)对不起哈
3(a²-1)-2(a+1-a²)等于多少
我少打了一个是3(2a²-1)-2(a+1-a²)对不起哈
3(a²-1)-2(a+1-a²)等于多少我少打了一个是3(2a²-1)-2(a+1-a²)对不起哈
3(2a²-1)-2(a+1-a²)
=6a²-3-2a-2+2a²
=8a²-2a-5