copyright - copy right issue with using exact Text from a text book

Here is a question related to a website providing mathematics solutions for students. Here are details:

1. 
   

   Students will enter the page number and problem number on the website, and the site will show the text of the Mathematics problem described in that text book;

   
   


2. 
   

   then the web page will show the solution to that math problem.

   
   

My question is, is my web site violating the copyrights of the text book publishers for showing the text without their permission.

This is not just a one page/one time issue. The site may show hundreds of pages from the book.