作业帮[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/05 15:40:53
![[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]](/uploads/image/z/8516269-37-9.jpg?t=%5B%28x%26%23178%3B-y%26%23178%3B%29%2B%28x%26%23178%3B%2By%26%23178%3B%29%5D%5B%28x%26%23178%3B-y%26%23178%3B%29-%28x%26%23178%3B%2By%26%23178%3B%29%5D)
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
=(x²-y²+x²+y²)(x²-y²-x²-y²)
=(2x²)(-2y²)
=-4x²y²
前一个中括号打开得2X^2 后一个打开得﹣2Y^2所以乘起来得﹣4X^2Y^2
-4x²y²