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初级微积分示例数列和级数

Find the First Term

$2 n^{2} - 3$

解题步骤 1

代入 $n$ 的值以求出第 $n$ 项。

$a_{1} = 2 {(1)}^{2} - 3$

解题步骤 2

化简每一项。

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解题步骤 2.1

一的任意次幂都为一。

$a_{1} = 2 \cdot 1 - 3$

解题步骤 2.2

将 $2$ 乘以 $1$ 。

$a_{1} = 2 - 3$

$a_{1} = 2 - 3$

解题步骤 3

从 $2$ 中减去 $3$ 。

$a_{1} = - 1$

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数列和级数

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$