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f(x)=ax^2+bx+c(一)開口方向a>0時,開口向上a<0時,開口向上(二)極值x=-b/(2a)時存在極值極值大小=(4ac-b^2)/(4a)(三)與x軸交點當b^2-4ac>0時,與x軸有兩個交點;當b^2-4ac=0時,與x軸相切(即:有兩個交點)…
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