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本文用二次型理论给出了多元二次函数有最大 (小 )值的一个充分条件 ,并给出了最值点及其最值的求法 .对于一元二次函数f(x) =ax2 +bx +c (a≠ 0 ) ,当a0时 ,f(x)有最小值 ,当a 0时 ,f(x)