Question

已知二次函数y=f（x）最大值是f（1/2）=25/4，且过（2,4），求f（x）的表达式

Answer 1

初中数学解决者
设y=a(x-1/2)^2+25/4(a<0)
将（2，4）代入上式，得a=-1
f（x）=-(x-1/2)^2+25/4

Answer 2

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