(a+b)²-2(a²-b²)+(a-b)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/26 19:37:49
(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
=a²+2ab+b²-2a²+2b²+a²-2ab+b²
=4b²
(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
=a²+2ab+b²-2a²+2b²+a²-2ab+b²
=4b²