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How to extract the topic of mathematics paper
Purchase professional scanners and supporting software.

Buy professional scanners and supporting software, such as Hanwang's, but the price is not cheap, and most words can be recognized, but you still need to confirm the revision.

Or you can typeset in WORD, split the book into pages, scan it into a computer with a scanner, and then print it out as a document.

You can also take screenshots and print pictures directly. If you need to cut the picture before printing, you can correct it first. Click on the selected picture, right-click on a single computer and select Print. Set the picture size to be printed on the right side of the printed picture. Select whether to check the box when printing the border below. If it is removed, the printed border will be displayed. Set the number of copies to be printed in the lower left corner. After setting, click Print in the lower right corner to print out the picture.