作业帮[(b-2a)(-2a-b)-4(a-25)²]怎么做
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/18 02:54:08
![[(b-2a)(-2a-b)-4(a-25)²]怎么做](/uploads/image/z/5455823-23-3.jpg?t=%5B%28b-2a%29%28-2a-b%29-4%28a-25%29%26%23178%3B%5D%E6%80%8E%E4%B9%88%E5%81%9A)
[(b-2a)(-2a-b)-4(a-25)²]怎么做
[(b-2a)(-2a-b)-4(a-25)²]怎么做
[(b-2a)(-2a-b)-4(a-25)²]怎么做
(b-2a)(-2a-b)-4(a-25)²
=4a²-b²-4(a-25)²
=4[a²-(a-25)²]-b²
=4(50a-625)-b²
=200a-2500-b²
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来源：学生作业帮助网 编辑：作业帮 时间：2024/05/18 02:54:08
[(b-2a)(-2a-b)-4(a-25)²]怎么做
[(b-2a)(-2a-b)-4(a-25)²]怎么做
[(b-2a)(-2a-b)-4(a-25)²]怎么做
(b-2a)(-2a-b)-4(a-25)²
=4a²-b²-4(a-25)²
=4[a²-(a-25)²]-b²
=4(50a-625)-b²
=200a-2500-b²