作业帮5（5a²-b²）＋2[（-a²-b²）＋4（a²-1/4b²）]＋a²
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/19 00:33:08
![5（5a²-b²）＋2[（-a²-b²）＋4（a²-1/4b²）]＋a²](/uploads/image/z/5913332-44-2.jpg?t=5%EF%BC%885a%26%23178%3B-b%26%23178%3B%EF%BC%89%EF%BC%8B2%5B%EF%BC%88-a%26%23178%3B-b%26%23178%3B%EF%BC%89%EF%BC%8B4%EF%BC%88a%26%23178%3B-1%2F4b%26%23178%3B%EF%BC%89%5D%EF%BC%8Ba%26%23178%3B)
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5（5a²-b²）＋2[（-a²-b²）＋4（a²-1/4b²）]＋a²
5（5a²-b²）＋2[（-a²-b²）＋4（a²-1/4b²）]＋a²
5（5a²-b²）＋2[（-a²-b²）＋4（a²-1/4b²）]＋a²
25a²-5b²-2a²-2b²+4a²-b²+a²=28a²-8b²
最终等于28a²-8b²
希望对你有所帮助 望采纳！
原式 =25a²-5b²-2a²-2b²＋4a²-b²＋a² =25a²-2a²＋4a²＋a²-5b²-2b²-b² =28a²-8b²