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时下,只要你步入大小书店,张爱玲小说、散文集、张爱玲传记就会闯入你的视野。读张爱玲、研究张爱玲的人日渐增多。一股“张爱玲热”扑面而来。1943年5月,张爱玲在上海的《
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)
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