作业帮计算：（2x-3y)²(2x+3y)²（2x-3y)²(2x+3y)²=（4x²-12xy+9y²)(4x²+12xy+9y²)=[4x²-(12xy-9y²)] [4x²+(12xy+9y²)]=16x^4-(12xy-9y²)²大伙看看这个方法有没有问题.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 19:37:09
![计算：（2x-3y)²(2x+3y)²（2x-3y)²(2x+3y)²=（4x²-12xy+9y²)(4x²+12xy+9y²)=[4x²-(12xy-9y²)] [4x²+(12xy+9y²)]=16x^4-(12xy-9y²)²大伙看看这个方法有没有问题.](/uploads/image/z/388251-27-1.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%882x-3y%29%26%23178%3B%282x%2B3y%29%26%23178%3B%EF%BC%882x-3y%29%26%23178%3B%282x%2B3y%29%26%23178%3B%3D%EF%BC%884x%26%23178%3B-12xy%2B9y%26%23178%3B%29%284x%26%23178%3B%2B12xy%2B9y%26%23178%3B%29%3D%5B4x%26%23178%3B-%2812xy-9y%26%23178%3B%29%5D+%5B4x%26%23178%3B%2B%2812xy%2B9y%26%23178%3B%29%5D%3D16x%5E4-%2812xy-9y%26%23178%3B%29%26%23178%3B%E5%A4%A7%E4%BC%99%E7%9C%8B%E7%9C%8B%E8%BF%99%E4%B8%AA%E6%96%B9%E6%B3%95%E6%9C%89%E6%B2%A1%E6%9C%89%E9%97%AE%E9%A2%98.)
计算：（2x-3y)²(2x+3y)²（2x-3y)²(2x+3y)²=（4x²-12xy+9y²)(4x²+12xy+9y²)=[4x²-(12xy-9y²)] [4x²+(12xy+9y²)]=16x^4-(12xy-9y²)²大伙看看这个方法有没有问题.
计算：（2x-3y)²(2x+3y)²
（2x-3y)²(2x+3y)²
=（4x²-12xy+9y²)(4x²+12xy+9y²)
=[4x²-(12xy-9y²)] [4x²+(12xy+9y²)]
=16x^4-(12xy-9y²)²
大伙看看这个方法有没有问题.
计算：（2x-3y)²(2x+3y)²（2x-3y)²(2x+3y)²=（4x²-12xy+9y²)(4x²+12xy+9y²)=[4x²-(12xy-9y²)] [4x²+(12xy+9y²)]=16x^4-(12xy-9y²)²大伙看看这个方法有没有问题.
（2x-3y)²(2x+3y)²
=[(2x-3y)(2x+3y)]²
=(4x²-9y²)²
=16x⁴-72x²y²+81y⁴
你的方法没问题,但是这样算的话变复杂了,要利用公式时计算简便