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二次函数的开口大小取决于什么

更新时间: 2020-10-22 00:00:00     

二次函数开口大小是由二次项系数a决定的,a的绝对值越小,开口越大;a的绝对值越大,开口越小。重要概念:a,b,c为常数,a≠0,且a决定函数的开口方向。a>0时,开口方向向上;a

关键词: 函数 开口 大小 取决于 什么

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