You are the difficult of the resolve problems?

Very simple. Cover next step:

1. E-mail to [email protected] specifying:

                    a. the number of chapter;

                    b. the number of exercise;

                    c. the method try for a resolve .

2. Wait your message, and then:

3. Look the answer in Difficult problems solutions , from the index page.

The answer arrive in briefly. Not despair. Up to then resolve any esercices ...