Whe I use =IF(A1=25,"text........") the output invades from A to J and it´s impossible to print it in one paper page.How can I do to print it in one page?

Um... are you in Excel? It's more useful when you tell us what software you're using.

In the page setup there's a button you can click to "fit to x pages" and set that to 1.

If you have Excel 2007, in the Page Layout tab, directly right of where it says Page Setup is a tiny box with an arrow. If you click that you will get into Page Setup box (if you have a version prior to Excel 2007, Page Setup is in the File menu). On the Page tab is the scaling feature where you can tell it to fit the page to x wide and/or x long.