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一、利用图象求二次函数在有限区间的量大(小)值.二次函数 f(x)=ax~2+bx+c(a>0)在区间[m,n]上的最大(小)值.由下列图象可知
First, use the image to find the quadratic function of the quadratic function in the finite range of large (small) value. The quadratic function f (x) = ax ~ 2 + bx + c (a> 0) in the interval [m, n] maximum (Small) value. Known from the following image