I agree with max99 that the equations are almost certainly images. You can magnify the image, although this might just produce a pixelated mess. It is worth trying. From the manual:
Quote:
Increasing the Size of a Picture
If you’d like to see a larger size of a picture or image you encounter in your reading material, simply follow these steps to zoom temporarily on the image.
1. Use the 5-way controller to position the cursor over the picture.
2. An image of a magnifying glass with a plus sign will appear on top of the picture.
3. Press the 5-way to zoom the image. You will see a expanded view of the picture that rotates if necessary to maximize the use of the display.
4. Press the 5-way (or any key or button, except the Home button) to return to your content.
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Rotating to landscape might also automatically magnify the image, depending on how it is defined in the ebook.