若(a+b)²=(a-b)²+M,则M为__
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 06:47:45
![若(a+b)²=(a-b)²+M,则M为__](/uploads/image/z/11049987-3-7.jpg?t=%E8%8B%A5%EF%BC%88a%2Bb%29%26%23178%3B%3D%28a-b%29%26%23178%3B%2BM%2C%E5%88%99M%E4%B8%BA__)
若(a+b)²=(a-b)²+M,则M为__
若(a+b)²=(a-b)²+M,则M为__
若(a+b)²=(a-b)²+M,则M为__
(a+b)²=(a-b)²+M
所以M=(a+b)^2-(a-b)^2=4ab
(a+b)²
=a²+2ab+b²
=a²-2ab+b²+4ab
=(a-b)²+4ab
M=4ab
答案是 4ab
(a+b)^2=a^2+b^2+2ab=a^2+b^2-2ab+4ab=(a-b)^2+4ab
4ab啊,你初几啊?都知道提问,怎么会不知道答案?