若(a+b)²=(a-b)²+A.则A为?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 18:02:48
![若(a+b)²=(a-b)²+A.则A为?](/uploads/image/z/10889532-36-2.jpg?t=%E8%8B%A5%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%3D%EF%BC%88a-b%EF%BC%89%26%23178%3B%2BA.%E5%88%99A%E4%B8%BA%3F)
若(a+b)²=(a-b)²+A.则A为?
若(a+b)²=(a-b)²+A.则A为?
若(a+b)²=(a-b)²+A.则A为?
(a+b)^2 = a^2 +b^2 +2ab
(a-b)^2 = a^2 +b^2 -2ab
两式相减
A =4ab
4ab ...........
a²+2ab+b²=a²-2ab+b²+A,A=4ab
4ab
4ab
4ab
答案4 a b
4ab
4ab