已知抛物线与x轴交于点M(-1,0),N(2,0),且经过点(1,2),求这个函数的解析式?三种方法.我已做出交点法和代值法,还差个顶点法就算不能用,但要三种方法啊!
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![已知抛物线与x轴交于点M(-1,0),N(2,0),且经过点(1,2),求这个函数的解析式?三种方法.我已做出交点法和代值法,还差个顶点法就算不能用,但要三种方法啊!](/uploads/image/z/8324774-62-4.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9M%28-1%2C0%29%2CN%282%2C0%29%2C%E4%B8%94%E7%BB%8F%E8%BF%87%E7%82%B9%281%2C2%29%2C%E6%B1%82%E8%BF%99%E4%B8%AA%E5%87%BD%E6%95%B0%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%3F%E4%B8%89%E7%A7%8D%E6%96%B9%E6%B3%95.%E6%88%91%E5%B7%B2%E5%81%9A%E5%87%BA%E4%BA%A4%E7%82%B9%E6%B3%95%E5%92%8C%E4%BB%A3%E5%80%BC%E6%B3%95%2C%E8%BF%98%E5%B7%AE%E4%B8%AA%E9%A1%B6%E7%82%B9%E6%B3%95%E5%B0%B1%E7%AE%97%E4%B8%8D%E8%83%BD%E7%94%A8%2C%E4%BD%86%E8%A6%81%E4%B8%89%E7%A7%8D%E6%96%B9%E6%B3%95%E5%95%8A%21)
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