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二次函數(quadratic function)是指未知數的最高次數為二次的多項式函數.二次函數可以表示為f(x)=ax^2+bx+c(a不為0).其影像是一條主軸平行於y軸的抛物線.一般地,引數x和因變數y之間存在如下關係:一般式:1:y=ax…
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