1.已知4x²-ax+1可化为(2x-b)²的形式,则ab=_______.2.试说明:不论x,y取何值,代数式4x²+y²-4x+6y+11的值总是整数.你能求出当x,y取何值时,这个代数式的值最小?3.用因式分解法解下列方程
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![1.已知4x²-ax+1可化为(2x-b)²的形式,则ab=_______.2.试说明:不论x,y取何值,代数式4x²+y²-4x+6y+11的值总是整数.你能求出当x,y取何值时,这个代数式的值最小?3.用因式分解法解下列方程](/uploads/image/z/4336106-50-6.jpg?t=1.%E5%B7%B2%E7%9F%A54x%26%23178%3B-ax%2B1%E5%8F%AF%E5%8C%96%E4%B8%BA%EF%BC%882x-b%EF%BC%89%26%23178%3B%E7%9A%84%E5%BD%A2%E5%BC%8F%2C%E5%88%99ab%3D_______.2.%E8%AF%95%E8%AF%B4%E6%98%8E%EF%BC%9A%E4%B8%8D%E8%AE%BAx%2Cy%E5%8F%96%E4%BD%95%E5%80%BC%2C%E4%BB%A3%E6%95%B0%E5%BC%8F4x%26%23178%3B%2By%26%23178%3B-4x%2B6y%2B11%E7%9A%84%E5%80%BC%E6%80%BB%E6%98%AF%E6%95%B4%E6%95%B0.%E4%BD%A0%E8%83%BD%E6%B1%82%E5%87%BA%E5%BD%93x%2Cy%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E8%BF%99%E4%B8%AA%E4%BB%A3%E6%95%B0%E5%BC%8F%E7%9A%84%E5%80%BC%E6%9C%80%E5%B0%8F%3F3.%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B)
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