抛物线y=ax^2-3ax+b经过点(-1,0)(3.2),
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![抛物线y=ax^2-3ax+b经过点(-1,0)(3.2),](/uploads/image/z/13899202-34-2.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2-3ax%2Bb%E7%BB%8F%E8%BF%87%E7%82%B9%28-1%2C0%29%283.2%29%2C)
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et,
抛物线y=ax^2-3ax+b经过点(-1,0)(3.2),
抛物线y=ax^2-3ax+b经过点(-1,0)(3.2),
抛物线y=ax^2-3ax+b经过点(-1,0)(3.2),
点(-1,0)(3.2)坐标代入得:
0=a+3a+b=4a+b
2=9a-6a+b=3a+b
解得:a=-2,b=8
y=-2x^2+6x+8
直接把两个点分别代入就可以了