1.已知代数式ax的平方+bx+c,当x=1时,其值为-4;当x=7时,其值为8;当x=5时,其值为0,求a,b,c的值2.已知(a-2b-4)的平方+(2b+c)的平方+la-4b+cl=o,求3a+b-c的值快点\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
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![1.已知代数式ax的平方+bx+c,当x=1时,其值为-4;当x=7时,其值为8;当x=5时,其值为0,求a,b,c的值2.已知(a-2b-4)的平方+(2b+c)的平方+la-4b+cl=o,求3a+b-c的值快点\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\](/uploads/image/z/586348-52-8.jpg?t=1.%E5%B7%B2%E7%9F%A5%E4%BB%A3%E6%95%B0%E5%BC%8Fax%E7%9A%84%E5%B9%B3%E6%96%B9%2Bbx%2Bc%2C%E5%BD%93x%3D1%E6%97%B6%2C%E5%85%B6%E5%80%BC%E4%B8%BA-4%3B%E5%BD%93x%3D7%E6%97%B6%2C%E5%85%B6%E5%80%BC%E4%B8%BA8%3B%E5%BD%93x%3D5%E6%97%B6%2C%E5%85%B6%E5%80%BC%E4%B8%BA0%2C%E6%B1%82a%2Cb%2Cc%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A5%28a-2b-4%29%E7%9A%84%E5%B9%B3%E6%96%B9%2B%282b%2Bc%29%E7%9A%84%E5%B9%B3%E6%96%B9%2Bla-4b%2Bcl%3Do%2C%E6%B1%823a%2Bb-c%E7%9A%84%E5%80%BC%E5%BF%AB%E7%82%B9%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C)
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