数学问题--------平方差公式&完全平方公式1.把(x+2y-3)(x-2y-3)变为________,能应用平方差公式计算2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
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![数学问题--------平方差公式&完全平方公式1.把(x+2y-3)(x-2y-3)变为________,能应用平方差公式计算2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)](/uploads/image/z/2584849-49-9.jpg?t=%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98--------%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%26%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%85%AC%E5%BC%8F1.%E6%8A%8A%28x%2B2y-3%29%28x-2y-3%29%E5%8F%98%E4%B8%BA________%2C%E8%83%BD%E5%BA%94%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%972.%28x%2By%29%26%23178%3B%28x-y%29%26%23178%3B-%28x-y%29%28x%2By%EF%BC%89%28x%26%23178%3B%2By%26%23178%3B%29)
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