f(x)=ax²+bx+c=a(x-1)(x-2)0
b=-3a,c=2a
函数y=f(x)的图像过点(-1,2),有
a-b+c=2
解得a=1/3,b=-1,c=2/3
二次函数y=f(x)的解析式为：f(x)=x²/3-x+2/3
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