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.
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![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.)
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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