作业帮[(a+1/2b)²+(a-1/2b)²]·（2a²-1/2b²）,其中a=-3,b=4
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 12:59:22
![[(a+1/2b)²+(a-1/2b)²]·（2a²-1/2b²）,其中a=-3,b=4](/uploads/image/z/757907-35-7.jpg?t=%5B%28a%2B1%2F2b%29%26%23178%3B%2B%28a-1%2F2b%29%26%23178%3B%5D%C2%B7%EF%BC%882a%26%23178%3B-1%2F2b%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D-3%2Cb%3D4)
[(a+1/2b)²+(a-1/2b)²]·（2a²-1/2b²）,其中a=-3,b=4
[(a+1/2b)²+(a-1/2b)²]·（2a²-1/2b²）,其中a=-3,b=4
[(a+1/2b)²+(a-1/2b)²]·（2a²-1/2b²）,其中a=-3,b=4
[(a+1/2b)²+(a-1/2b)²]·（2a²-1/2b²）
=(a²+ab+1/4b²+a²-ab+1/4b²)(2a²-1/2b²)
=(2a²+1/2b²)(2a²-1/2b²)
=(18+8)(18-8)
=26×10
=260