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Home » How to Level Up Your Drawings: The Hidden Class That Changed My Practice! - Upplift

How to Level Up Your Drawings: The Hidden Class That Changed My Practice! - Upplift

📅 February 28, 2026 👤 scraface

Feb 28, 2026

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🔥 Popular Posts

A rectangle has a length that is twice its width. If the perimeter of...
Let the width of the rectangle be \( w \) meters.
Then, the length is \( 2w \) meters.
The perimeter of a rectangle is given by:
\[ 2(\text{Length} + \text{Width}) = 60 \]
\[ 2(2w + w) = 60 \]
\[ 2(3w) = 60 \]
The length is \( 2 \times 10 = 20 \) meters.
The area of the rectangle is:
\[ \text{Area} = \text{Length} \times \text{Width} = 20 \times 10 = 20...

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## Step-by-Step Solution
我们从给定函数 $ f(x) = x - \frac{x^2}{2} $ 开始。
需要计算 $ b_3 = f(f(3)) $。
第一步：计算 $ f(3) $
代入 $ x = 3 $：
f(3) = 3 - \frac{3^2}{2} = 3 - \frac{9}{2} = 3 - 4.5 = -1.5
第二步：计算 $ f(f(3)) = f(-1.5) $
现在令 $ x = -1.5 $：
f(-1.5) = -1.5 - \frac{(-1.5)^2}{2} = -1.5 - \frac{2.25}{2} = -1.5 - 1...
因此，$ b_3 = -2.625 = -\frac{21}{8} $

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