高效办公必备，在线工具箱视频，轻松提升工作效率

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The image shows a mathematical expression:

咕嗝在线工具箱

[ \frac{1}{2} + \frac{3}{4} - \frac{5}{8} ]

To solve this, we need to find a common denominator for the fractions involved.

Step-by-step Solution:

1. Identify the Denominators: The denominators are (2), (4), and (8).

2. Find the Least Common Multiple (LCM):

   The LCM of (2), (4), and (8) is (8).

3. Convert Each Fraction:

   • Convert (\frac{1}{2}) to have a denominator of (8): [ \frac{1}{2} = \frac{1 \times 4}{2 \times 4} = \frac{4}{8} ]
   • Convert (\frac{3}{4}) to have a denominator of (8): [ \frac{3}{4} = \frac{3 \times 2}{4 \times 2} = \frac{6}{8} ]
   • (\frac{5}{8}) already has a denominator of (8).

4. Perform the Addition and Subtraction:

   • Add (\frac{4}{8} + \frac{6}{8} = \frac{10}{8}).
   • Subtract (\frac{10}{8} - \frac{5}{8} = \frac{5}{8}).

Therefore, the final answer is:

[ \boxed{\frac{5}{8}} ]