斜率 y=sqrt(1-4x),\at x=-1

解答

斜率

y = 1 - 4 x, at x = - 1

- \frac{2}{5}

十进制

- 0.89442 \dots

求解步骤

y = 1 - 4 x

要确定函数的斜率，对

1 - 4 x

求导

\frac{d}{d x} (1 - 4 x) = - \frac{2}{1 - 4 x}

- \frac{2}{1 - 4 x}

确定

x = - 1

时的

- \frac{2}{1 - 4 x}

的值:

- \frac{2}{5}

- \frac{2}{5}

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