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指数函数知识点归纳(完整)

发布时间:2022-10-13 20:10:04 来源:网友投稿

下面是小编为大家整理的指数函数知识点归纳(完整),供大家参考。

指数函数知识点归纳(完整)

 

 指数函数知识点归纳

  本节知识点

  1、

  (一般的, 如果 x a, 那么 x 叫做 a 的 n 次方根, 其中 n 1, 且 n N*. )

 n

    正数的 n 次方根是正数 

  当 n 是奇数时,    负数的 n 次方根是负数 5  5

    正数的 n 次方根有 2 个, 且互为相反数如:

 a 0, 则 n 次方根为 当 n 是偶数时,  

   负数没有偶次方根

    0 的任何次方根都是 0

 2

  

 当 n a

   a, a 0 

  当 n a    a, a 0 3、

 分数指数幂

  m *n 正分数指数幂的意义 a a 0, m, n N, 且 n 1)  m 

 当 a 为正数时,

   1*n 负分数指数幂的意义 a m(a 0, m, n N, 且 n 1)  an 

    当 a 为 0 时,   0 的正分数指数幂等于 0

   0 的负分数指数幂无意义

  4、

 有理指数幂运算性质

  ①aras ar s(a 0, r, s Q)

 rsrs(a)  a(a 0, r, s Q)

 ②

  ③(ab) r arbr(a 0, b 0, r Q)

 5、 指数函数的概念 1

  6、 指数函数 x

 在底数 a 1 及 0 a 1 这两种情况下的图象和性质:

 7、 比较指数或指数幂的大小

  (1)

 30. 8, 30. 7(2)

 1. 70. 8, 0. 92. 3(3)

 am an(0 a 1) (4)

 am an(a 1)

 x8、 指出函数 y 2 与 y () 图象间的关系 (动手画图, 猜想概括)

 1

  2x

  9、 方法总结 2

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