Todo sobre la radicación.

http://www.vitutor.com/di/re/r8e.html
http://www.vitutor.com/di/re/r9e.html
http://www.vitutor.com/di/re/r10e.html
http://www.vitutor.com/di/re/r11e.html 
http://www.vitutor.com/di/re/r12e.html
http://www.vitutor.com/di/re/r13e.html
http://www.vitutor.com/di/re/r14e.html
http://www.vitutor.com/di/re/r15e.html
http://www.vitutor.com/di/re/r16e.html