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$ f'(x) = \lim \limits _{\Delta x \rightarrow 0} \frac {f(x + \Delta x) - f(x)} {\Delta x} $

$
f(x) = \begin {cases}
x, & \text {if } x \ge 0 \\
-x, & \text {if } x < 0
\end {cases}
$

```mermaid
flowchart LR
    A[Hard] -->|Text| B(Round)
    B --> C{Decision}
    C -->|One| D[Result 1]
    C -->|Two| E[Result 2]
```

```mermaid
requirementDiagram

requirement rider_safety {
        id: 1
        text: Riders must be able to stop safely in all conditions.
        risk: high
        verifymethod: test
    }

functionalRequirement brake_response {
        id: 1.1
        text: Brakes engage within 100 ms of lever pull.
        risk: medium
        verifymethod: test
    }

performanceRequirement stopping_distance {
        id: 1.2
        text: Stop from 25 km/h within 4 m on dry pavement.
        risk: medium
        verifymethod: demonstration
    }

designConstraint water_resistance {
        id: 1.3
        text: Brake electronics must be IP67 rated.
        risk: low
        verifymethod: inspection
    }

element brake_controller {
        type: hardware
        docRef: "specs/brake-controller"
    }

element road_test_suite {
        type: "test suite"
        docRef: "qa/road-tests"
    }

rider_safety - contains -> brake_response
    rider_safety - contains -> stopping_distance
    brake_response - derives -> water_resistance
    brake_controller - satisfies -> brake_response
    road_test_suite - verifies -> stopping_distance
```

$f^{'} (x) = Δ x \to 0 lim \frac{f ( x + Δ x ) - f ( x )}{Δ x}$

f (x) = {x, - x, if x \geq 0 if x < 0

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最后于 2026-9-14 15:16 被kanxue编辑，原因：

zZhouQing 雪币： 579 活跃值： (2302) 能力值： ( LV12，RANK：229 ) 在线值：发帖 20 回帖 88 粉丝 57 关注私信	zZhouQing 3 2 楼手机端无法编辑markdown的评论，进入到markdown编辑器里，点击内容编辑框焦点产生，出现刷新，焦点消失，输入法无法出现。富文本编辑器正常。最后于 2026-10-24 00:27 被zZhouQing编辑，原因： 2026-10-24 00:26 0
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